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
To find four numbers that multiply to 840, one possible combination is 2, 3, 5, and 28. Another combination could be 1, 7, 12, and 10. There are multiple sets of numbers that can achieve this product, as 840 has various factorizations.
842
you could multiply 84 by 10 = 840 then multiply 84 by 2 = 168 add these two numbers = 1008