Counting On and Counting Back with Hundred Board

The sum of two numbers can be found by starting with one of the numbers and counting on by an amount equal to the second number. To find 15 + 3, start at 15 and count on 3. To find 23 + 15, start at 15 and count on 2 tens and 3 ones.



Counting On and Counting Back using the Brainingcamp Hundred Board virtual manipulative.

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