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Deputy School Exam 5 Practice

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What is the product of 6.4 and 3.5?
Correct Answer:
22.4
Explanation:
When you multiply decimals, multiply as if they are whole numbers and then place the decimal point according to the total number of decimal digits involved. Here, 6.4 has one decimal place and 3.5 has one decimal place, so the product will have two decimal places. Convert to integers: 64 × 35 = 2240. Since there are two decimal places in total, place the decimal point two places from the right: 2240 ‑ 22.40, which is 22.4. A quick check helps confirm: 6.4 × 3.5 ≈ (6 × 3.5) + (0.4 × 3.5) = 21 + 1.4 = 22.4. The product is 22.4.

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