A number like 675 is really an addition problem. Each place value is added together to form the sum (the number). If we regroup the numbers thereby changing the individual place values, we still don't change the outcome. It's still the same number!
Regrouping whole numbers is a free educational video by Khan Academy.It helps students in grades 5 practice the following standards 5.NBT.A.1.
1. 5.NBT.A.1 : Recognize that in a multi-digit number, a digit in one place represents 10 times as much as it represents in the place to its right and 1/10 of what it represents in the place to its left. .
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