Multiplying by One-digit Numbers with Base Ten Blocks

Multiplication can be thought of as the first number telling how much to take of the second number. So multiplying 4 × 12 is like finding the total value of 4 groups of 12. There are 4 tens and 8 ones in total, so 4 × 12 = 48. Multiplication can also be thought of as finding the total value of a rectangle 12 units long and 4 units high. The length of 12 can be decomposed into 1 ten and 2 ones, so 4 × 12 can be thought of as (4 × 10) + (4 × 2), or 40 + 8, or 48. To find products quickly, line up the factors along their ones place, multiply the ones, multiply the tens, and then add the partial products.



Multiplying by One-digit Numbers using the Brainingcamp Base Ten Blocks virtual manipulative.

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