How do you subtract 840000000 - 42000000 and write the answer in scientific notation?

1 Answer
Meave60
Apr 2, 2015

The answer is 7.98xx10^8.

840 000 000 - 42 000 000=798 000 000

In order to convert 798000000 to scientific notation, move the decimal to the left eight places so that the coefficient is 7.98. Since the decimal is moved to the left eight places, the exponent on the base 10 is positive eight. So the number in scientific notation is 7.98xx10^8.

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