The array can be shown as 5 groups of 3 showing that 5 x 3 = 15. Or it could be shown as 3 groups of 5 showing that 3 x 5 = 15. This demonstrates that multiplication is commutative. Image caption, ...
Addition explained, getting the same total when adding different numbers and making addition easier using chunking and the column method. Subtracting numbers using the column and chunking method ...
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