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# Course Updates for Pre-Algebra in July 2021

Updated

We are excited to share that we've made significant enhancements to our Pre-Algebra. 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 61%. 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!

Articles

Exercises

Videos

### Content Removed

Articles

 Absolute value review Adding decimals Adding negative numbers review Associative property of multiplication review Classifying numbers review Common denominators review Commutative property of multiplication review Comparing fractions review Coordinate plane parts review Decimal place value review Decimals in expanded form review Decimals in written form review Decomposing fractions review Distributive property explained Distributive property review Dividing decimals Dividing fractions review Dividing negative numbers review Equivalent fractions review Factors and multiples review Graphing coordinates review Intro to absolute value Intro to negative numbers Mixed numbers and improper fractions review Multiplying decimals (no standard algorithm) Multiplying fractions review Multiplying negative numbers review Number opposites Number opposites review One-step equations review Ordering negative numbers Points on the coordinate plane Properties of addition Properties of multiplication Subtracting decimals Subtracting negative numbers review Whole number place value review Whole numbers in expanded form review Whole numbers in written form review Writing decimals as fractions review Writing fractions as decimals review

Exercises