Mental math is easy: multiply 2-digit numbers with partial products (grade 4 math)
Partial products means we multiply numbers part-by-part. For example, 5 x 36 is done as 5 x 30 and 5 x 6, and those two parts are added. You can quite easily do these in your head when one number has two digits and the other has one. This concept is ver
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08/30/2020 04:16 PM
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