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Anonymous
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28 x 5 = 104
7x4=28
70 x 2 = 140 28 x 5 = 140 and so on.
1 x 28, 2 x 14, 4 x 7, 7 x 4, 14 x 2, 28 x 1.
You can double the multiplication fact 14 to find 28.