Knowing the doubles number facts is a useful math skill for many everyday situations.
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After the “count on” strategies, used for adding 1, 2, or 3, the next easiest set of addition facts is the doubles.
Everyday examples can be found for most of these facts, such as the legs on a chair or table (double 2) or the number of eggs in a dozen package (double 6).
Once doubles are learned, related subtraction facts can be accessed, as the inverse of the doubles addition facts. For example, once “7 + 7 = 14” is known, “14 – 7 = ___” is straightforward.
Students can be asked to double larger number such as multiples of ten (e.g., “30 + 30 = ____”). Later, ones can be added, such as “73 + 73 = ____”
