an infinite number. 1x168, 2 x 84, 3x56, 4x42, 6x28, 7x24, 8x21, 12x14, but you can also use decimals and fractions and negative numbers as well. 1/2 x 336, 0.1 x 1680 etc
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How about: 5*9 = 45 as one example
They are: 1*15 = 15 and 5*3 = 15
1 x 41, 41 x 1
2.5 x 2 and 1 x 5
24x1, 12x2, 8x3, 6x4