Addition Grouping

This topic will help you when adding many numbers together.

When adding numbers together, first find the pairs of numbers that add up to 10. This makes the problem easier to solve.

For example, solve 3 + 6 + 4 + 7 + 8 + 5 + 2 = ?

To simplify the problem, find the pairs that add up to 10.
3 + 6 + 4 + 7 + 8 + 5 + 2 = ?
(3 + 7) + (6 + 4) + (8 + 2) + 5 = ?
10 + 10 + 10 + 5 = ?
30 + 5 = 35

30 + 5 is easier to solve than 3 + 6 + 4 + 7 + 8 + 5 + 2

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