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.
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The square root of 16 is 4, because 4 multiplied by itself is 16. 4 times 4 is 16 because 4+4 is 8, + 4 is 12, + 4 is 16.
As a product of its prime factors: 2*2*7*7 = 196
3 x 7 x 7 = 147
2,5,10,360
2x2=4