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The factors of 81 are 1, 3, 9, 27, and 81.

The factors of 162 are 1, 2, 3, 6, 9, 18, 27, 54, 81, and 162.

81 is the first common multiple over 80 of 81 and 162.

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Q: What are two numbers that have there first common multiples over 80?
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