Arithmetic Grade Four

Lesson Four: Addition Review

The order of addends does not change the sum. For instance, both 6+1 and 1+6 produce a sum of 7:

6 + 1 = 7 1 + 6 = 7

This is also true when there are more than two addends. Study these examples:

1 + 5 + 2 + 1 = 9 5 + 2 + 1 + 1 = 9 1 + 1 + 2 + 5 = 9 2 + 1 + 1 + 5 = 9

This is also true when working with two-digit addends:

35 + 21 = 56 21 + 35 = 56

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