7.87 x 104 = 78700
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3.45 x 10^1
10 to the zero is 1, so answer is 4
10 to the 3rd power is 1000, so 4000.
Well, darling, 4 times 10 to the 4th power is 40,000. It's as simple as that. Math doesn't have to be a drama, just multiply the 4 by the number of zeroes in 10 to the 4th power, and voila, you've got your answer.
4,000