Course Updates for Arithmetic in July 2021
We are excited to share that we've made significant enhancements to our Arithmetic course. One consequence of adding this new content is that it may impact learners’ Mastery percentages.
When we add new content and remove old content, Mastery percentages often change because the number of available skills changes. For example, if you mastered 90 out of 100 skills in a course, and we added 10 new skills, your mastery skill count would then be 90 out of 110. This change would change your Mastery percentage from 90% to 82%.
With this specific course update, we expect that Mastery percentages will change by a maximum of 54%. Most people will see a much smaller Mastery percentage change.
You can see exactly what content items we’ve added and removed below. Happy learning!
Content Added
Articles
Exercises
Videos
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Addition & subtraction: find the missing value (part 1 of 2) |
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Addition & subtraction: find the missing value (part 2 of 2) |
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Introduction to division with partial quotients (no remainder) |
Content Removed
Articles
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Absolute value review |
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Dividing decimals |
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Dividing fractions review |
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Equivalent fractions review |
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Multiplying fractions review |
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Number opposites |
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Number opposites review |
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Ordering negative numbers |
Exercises
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2-step addition word problems within 100 |
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2-step subtraction word problems within 100 |
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Absolute value to find distance |
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Add & subtract within 20 |
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Add 2-digit numbers by making tens |
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Add and subtract on the number line word problems |
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Add and subtract within 20 word problems |
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Add on a number line |
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Add within 100 using a number line |
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Add within 100 using place value blocks |
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Add within 1000 |
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Add within 20 |
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Add within 20 visually |
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Add within 5 |
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Adding & subtracting decimals word problems |
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Adding & subtracting negative numbers |
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Adding decimals: hundredths |
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Adding decimals: tenths |
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Adding decimals: thousandths |
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Adding up to four 2-digit numbers |
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Adding up to four 2-digit numbers word problems |
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Adding with arrays |
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Addition word problems within 100 |
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Array word problems |
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Break apart 2-digit addition problems |
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Break apart 3-digit addition problems |
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Break apart 3-digit subtraction problems |
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Compare and order absolute values |
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Compare decimal place value |
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Compare decimals (tenths and hundredths) |
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Compare decimals through thousandths |
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Compare fractions and mixed numbers |
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Compare fractions on the number line |
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Compare fractions using benchmark |
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Compare fractions with different numerators and denominators |
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Compare fractions with the same numerator or denominator |
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Compare fractions word problems |
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Converting fractions to decimals |
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Create division equations with area models |
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Decimals in words |
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Decimals in written and expanded form |
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Decimals on the number line: hundredths |
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Decimals on the number line: tenths |
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Dividing decimals 1 |
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Dividing decimals 2 |
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Dividing decimals: hundredths |
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Dividing decimals: thousandths |
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Dividing fractions word problems |
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Dividing whole numbers like 56÷35 to get a decimal |
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Division in contexts |
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Division with arrays |
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Equal groups |
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Find missing divisors and dividends (1-digit division) |
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Fraction and whole number division in contexts |
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Fractions in contexts |
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Multi-digit division |
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Multiplication in contexts |
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Multiply 1-digit numbers by 10, 100, and 1000 |
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Multiply by 1-digit numbers with standard algorithm |
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Multiply by tens |
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Multiply fractions and whole numbers with fraction models |
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Multiply using partial products |
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Multiply whole numbers by 0.1 and 0.01 |
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Multiply without regrouping |
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Multiplying decimals like 0.847x3.54 (standard algorithm) |
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Multiplying decimals like 2.45x3.6 (standard algorithm) |
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Multiplying decimals like 4x0.6 (standard algorithm) |
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Number opposites |
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Order decimals |
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Order decimals and fractions in different forms |
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Order fractions |
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Ordering negative numbers |
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Relate decimals and fractions in words |
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Relate fraction division to fraction multiplication |
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Relate number lines to fraction bars |
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Represent fraction multiplication with visuals |
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Rewriting decimals as fractions challenge |
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Round decimals |
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Round decimals challenge |
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Round decimals using a number line |
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Select strategies for adding within 100 |
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Select strategies for adding within 1000 |
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Select strategies for subtracting within 1000 |
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Signs of expressions |
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Simplify fractions |
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Subtract on a number line |
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Subtract within 100 using a number line |
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Subtract within 100 using place value blocks |
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Subtract within 1000 |
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Subtract within 20 |
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Subtract within 20 visually |
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Subtract within 5 |
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Subtracting decimals: hundredths |
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Subtracting decimals: tenths |
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Subtracting decimals: thousandths |
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Subtraction word problems within 100 |
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Understand multiplication using groups of objects |
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Unit fractions on the number line |
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Write common fractions as decimals |
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Write decimals and fractions shown on number lines |
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Write decimals as fractions |
Videos
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Absolute value as distance between numbers |
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Adding & subtracting decimals word problem |
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Adding 2-digit numbers without regrouping |
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Adding 3-digit numbers |
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Adding 53+17 by making a group of 10 |
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Adding 7 + 6 |
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Adding 8 + 7 |
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Adding and subtracting on number line word problems |
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Adding by making a group of 10 |
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Adding decimals word problem |
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Adding decimals: 0.822+5.65 |
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Adding decimals: 9.087+15.31 |
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Adding four two digit numbers |
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Adding fractions with unlike denominators |
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Adding mixed numbers with like denominators |
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Adding multiple 2-digit numbers word problems |
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Adding three decimals |
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Adding two digit numbers on a number line |
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Adding with arrays |
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Adding with regrouping |
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Adding within 20 using place value blocks |
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Adding within 20 using ten frames |
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Addition and subtraction with number lines |
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Addition and subtraction word problems: gorillas |
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Addition and subtraction word problems: superheroes |
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Addition word problem: horses |
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Basic addition |
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Basic subtraction |
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Breaking apart 2-digit addition problems |
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Breaking apart 3-digit addition problems |
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Comparing absolute values |
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Comparing and ordering fractions |
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Comparing decimals 2 |
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Comparing decimals 3 |
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Comparing decimals in different representations |
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Comparing decimals: 156.378 and 156.348 |
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Comparing decimals: 9.97 and 9.798 |
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Comparing fractions |
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Comparing fractions 2 (unlike denominators) |
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Comparing fractions with > and < symbols |
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Comparing fractions with like numerators and denominators |
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Comparing improper fractions and mixed numbers |
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Converting decimals to fractions 2 (ex 1) |
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Converting decimals to fractions 2 (ex 2) |
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Decimal place value |
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Decimals as words |
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Dividing by a multi-digit decimal |
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Dividing decimals completely |
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Dividing decimals with hundredths |
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Dividing whole numbers & fractions: t-shirts |
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Division in context |
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Equal groups |
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Expressing decimals in multiple forms |
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Fraction to decimal: 11/25 |
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Fraction word problem: lizard |
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Graphing hundredths from 0 to 0.1 |
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Graphing tenths from 0 to 1 |
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Identifying hundredths on a number line |
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Identifying tenths on a number line |
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Identifying unit fractions word problem |
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Intro to long division (no remainders) |
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Intro to multiplying 2 fractions |
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Intro to multiplying decimals |
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Intro to remainders |
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Long division with decimals |
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Long division: 280÷5 |
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Methods for subtracting 3-digit numbers |
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Missing number for 3-digit subtraction within 1000 |
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More ways to multiply |
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Multi step addition word problem |
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Multi-digit division strategies for decimals |
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Multi-step subtraction word problem |
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Multiplication in real world contexts |
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Multiplying 2-digit by 1-digit |
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Multiplying 3-digit by 1-digit |
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Multiplying 4-digit by 1-digit (regrouping) |
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Multiplying by multiples of 10 |
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Multiplying challenging decimals |
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Multiplying decimals: place value |
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Multiplying multi-digit numbers |
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Multiplying with distributive property |
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Number opposites |
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Ordering decimals |
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Ordering decimals 1 |
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Ordering decimals 2 |
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Ordering decimals through thousandths |
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Ordering fractions |
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Ordering negative numbers |
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Placing absolute values on the number line |
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Plotting decimal numbers on a number line |
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Relating decimals and fractions in words |
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Repeated addition: haircuts |
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Rewriting decimals as fractions: 0.15 |
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Rewriting decimals as fractions: 0.36 |
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Rewriting decimals as fractions: 0.8 |
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Rounding decimals on the number line |
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Strategies for adding 2-digit numbers |
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Strategies for dividing by tenths |
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Subtract within 20 using a number line |
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Subtract within 20 using place value blocks |
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Subtract within 20 using ten frames |
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Subtracting 10s using place value |
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Subtracting 14 - 6 |
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Subtracting 1s using place value |
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Subtracting 2-digit numbers without regrouping 1 |
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Subtracting decimals: 39.1 - 0.794 |
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Subtracting decimals: 9.005 - 3.6 |
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Subtracting fractions with unlike denominators |
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Subtracting in your head (no regrouping) |
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Subtracting mixed numbers with like denominators |
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Subtracting two-digit numbers without regrouping |
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Subtracting with regrouping (borrowing) |
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Subtraction by breaking apart |
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Subtraction word problem: basketball |
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Subtraction word problem: crayons |
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Subtraction word problem: snow |
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Subtraction word problem: tennis balls |
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The idea of division |
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Three digit addition word problems |
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Three digit subtraction word problems |
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Understanding place value when adding ones |
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Understanding place value when adding tens |
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Using arrays in word problems |
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Using place value to add 3-digit numbers: part 2 |
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Visualizing equivalent fractions |
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Worked example: Converting a fraction (7/8) to a decimal |
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Worked example: Rounding decimals to nearest tenth |
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Worked example: Subtracting 3-digit numbers (regrouping from 0) |
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Worked example: Subtracting 3-digit numbers (regrouping twice) |
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Worked example: Subtracting 3-digit numbers (regrouping) |
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Writing decimal numbers shown in grids |