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Answer: 1

The factors of 28 are 1, 2, 4, 7, 14, and 28.

The factors of 40 are 1, 2, 4, 5, 8, 10, 20, and 40.

The common factors are 1, 2, and 4; the least (smallest) common factor is 1.

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Q: What is the least common factor of 28 and 40?
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