Place Value and Rounding

I would like to request that more exercises pertaining to place value and rounding be included.

For place value, the exercises that are currently available combine many of the concepts involved with place value, so I would like to see them broken up into more exercises. For example, writing a number in expanded form, or taking the expanded form and determining the the number should be an exercise on its own. Also, converting between place values (1 ten = 10 ones, 1 hundred = 10 tens), place value models, and the value of a digit should each be made into their own exercise. 

For rounding, the same applies. I'd like to see an exercise that focuses on JUST rounding to the nearest 10 and 100 (using a number line), and then an exercise that JUST shows the numerical method of rounding to the nearest 10 or 100, and then an exercise that shows how to use the numerical method to round to any place, and then an exercise that JUST shows how to figure out the range of whole numbers that round to a certain value or the smallest/largest number that rounds to a certain value, and then JUST rounding decimals, and then a challenge exercise that brings all the topics together. 

I think that if the above is implemented, the place value and rounding topics will become much easier for students to learn on Khan Academy. Thank you so much for all the work you guys do - it really helps me and my students A LOT!