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The pairs of positive integer factors of 80 are:

1 x 80 = 80

2 x 40 = 80

4 x 20 = 80

5 x 16 = 80

8 x 10 = 80

Since multiplication sums are commutative, the reverses of the sums also hold true. For example, such that 8 x 10 = 80, also 10 x 8 = 80, and so on.

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Q: How many multiplication sums are there for 80?
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