Regrouping whole numbers

The topic  is under the 5th Grade Math Mission. This exercise introduces the concept of regrouping number to assist with borrowing.

Types of Problems
There re two types of problems in this exercise:


 * 1) Reorganize: This problem provides a number broken down by place value in the standard way, and a second break down in a non-standard way. The student is asked to fill in the missing value to ensure both representations are correct.Rwn1.png
 * 2) Fill chart: This problem starts with a given number and a chart that breaks down the number into it's place value pieces. The student is asked to fill in the chart with what ends up being an exhaustive list of the possibilities for those units.Rwn2.png

Strategies
This exercise is medium to get accuracy badges because the movements in the number are simple, although a couple might need to be read carefully. The speed badges are easy because the patterns are predictable and once you figure them out they can be performed rapidly.
 * 1) On Reorganize the place you move to sometimes had a zero before, so you need to read the units carefully.
 * 2) On Reorganize the number you will put in the slot is always ten more than value of the number to the right of the spot you are in.
 * 3) On Fill chart the left column always decreases by one, and the right column always increases by ten.