What is 45 × 35?

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• A 1575
• B 1525
• C 1565
• D 1475

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Answer: A. 1575

45 and 35 are both 5 away from 40, so 45 × 35 = (40 + 5)(40 - 5) = 40² - 5² = 1600 - 25 = 1575.

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