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Doubles help you go fast: 8 + 8 = 16, so 8 + 9 is one more: 17!
Make a ten: for 9 + 6, give 1 to the 9 to make 10, then 10 + 5 = 15.
Fact families share three numbers: 7 + 5 = 12, 5 + 7 = 12, 12 − 5 = 7 and 12 − 7 = 5.
Even numbers can be split into two equal groups. 14 is even because 7 + 7 = 14!
