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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