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Strategies for mental subtraction, part 1 (grades 2-3)
Автор: Math Mammoth
Загружено: 2018-10-18
Просмотров: 43592
Описание:
This first part covers two simple mental math strategies for subtracting a single-digit number from a two-digit number, such as 63 - 8 or 72 - 5.
The first strategy is to subtract in parts (or part-by-part). For example, think of 63 - 8 as 63 - 3 - 5. You first subtract 63 - 3 which is 60. Then you subtract the rest.
The second strategy is to use known subtraction facts. To solve 62 - 7 with this strategy means recalling 12 - 7 = 5. Then, the answer to 62 - 7 ends in 5, and is in the "previous ten", or in the fifties, thus it is 55.
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