1680
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There are an infinite number of correct answers.
Here are a few of them:
1, 840
2, 420
3, 280
4, 210
5, 168
6, 140
7, 120
8, 105
9, 93 and 1/3
10, 84
11, 76 and 4/11
12, 70
13, 64 and 8/13
14, 60
15, 56
16, 52.5
17, 49 and 7/17
18, 46 and 2/3
19, 44 and 4/19
20, 42
25, 33.6
28, 30
There are an infinite amount of numbers you can multiply to obtain 840 as the product.
5880
842
you could multiply 84 by 10 = 840 then multiply 84 by 2 = 168 add these two numbers = 1008
781