It is so very quick and easy to get the answer if only you can be bothered to use your calculator. But since you can't, the answer is 80.08
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143 is not prime - we can see this because it is 1 less than a square. x^2-1 = (x+1)(x-1), and for 143, x=12. Thus, 143=11*13.
56 = 1 x 56 56 = 2 x 28 56 = 4 x 14 56 = 7 x 8
2 x 2 x 2 x 7 = 56
The factor pairs of 56 are 1 x 56, 2 x 28, 4 x 14, and 7 x 8.
The factors of 56 are 1, 2, 4, 7, 8, 14, 28 and 56. The factor pairs of 56 are 1 x 56, 2 x 28, 4 x 14, and 7 x 8. The prime factors of 56 are 2, 2, 2, and 7. The prime factorization of 56 is 2 x 2 x 2 x 7.