Decimal × Integer
Multiply as whole numbers, then shift back: the product has as many decimals as the factor
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Multiply as whole numbers, then shift back: the product has as many decimals as the factor
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Decimals times integers: multiply as whole numbers first, then put the point back — as many decimal places in the factor means as many in the product. Each ribbon is 0.8 m, so how long are three together? Count the cells in the bar model — 8 cells × 3 = 24 cells, and 24 tenths make 2.4. Tap “Whole-number way” to see the ×10-then-÷10 trick unfold.
Each ribbon is 0.8 m long — how long are three together? Count cells in the bar model: 8 cells × 3 = 24 cells, and 24 tenths make 2.4. Tap “Whole-number way” to see the ×10-then-÷10 trick unfold.