Q: What multiplication problems that equal 45?

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How about: 5*9 = 45 as one example

2.5 x 2 and 1 x 5

As many as desired. An infinite number is possible.

1 x 41, 41 x 1

24x1, 12x2, 8x3, 6x4

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How about: 5*9 = 45 as one example

Using multiplication 40 times 45 = 1800

22x111x21x222x11

1x82x4

Infinite

Product of its prime factors are: 3*3*5 = 45

Infinitely many.

70*1.1 is one example.

3 are the ones i counted

5 x 9 = 45

Any, and every, multiplication problem must be "less than equal to or greater than one".

2.5 x 2 and 1 x 5