Write 0.000000657 * 10^15

657,000,000

Step-by-step explanation:

Find how many places the decimal should move to make a whole number. (Count the number of / 's)

0. 0 / 0 / 0 / 0 / 0 / 0 / 6 / 5 / 7 /

There are about 9 places to move.

697

Now subtract 9 from the power of 15th

15 - 9 = 6

There is 10^6 left, or 6 zeros left. Add those zeros to the current number.

697, 000, 000

Cheers!

0.000000657 * 10^15 = 657000000