What is 9 × 24?

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Multiple Choice

What is 9 × 24?

Explanation:
Multiplying by 9 can be done quickly by splitting the other factor. 9 × 24 = 9 × (20 + 4) = (9 × 20) + (9 × 4) = 180 + 36 = 216. A quick cross-check uses 10 minus 1: 9 × 24 = 24 × (10 − 1) = 240 − 24 = 216. So the product is 216. The other options don’t match 9 × 24 (for example, 198 is 9 × 22, 224 isn’t the product of 9 and 24, and 240 is 24 × 10, not 9 × 24).

Multiplying by 9 can be done quickly by splitting the other factor. 9 × 24 = 9 × (20 + 4) = (9 × 20) + (9 × 4) = 180 + 36 = 216. A quick cross-check uses 10 minus 1: 9 × 24 = 24 × (10 − 1) = 240 − 24 = 216. So the product is 216. The other options don’t match 9 × 24 (for example, 198 is 9 × 22, 224 isn’t the product of 9 and 24, and 240 is 24 × 10, not 9 × 24).

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