Write the number starting with the first non-zero digit and put the decimal point after this digit; then multiply it by 10 to the power of the number of digits to move the decimal point to get it back to where it was originally, if to the left make the power negative.
→ 675 = 6.75 x 10²
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675 000 000 in scientific notation is 6.75*108
You write 0.00007463 in scientific notation as: 7.463 × 10-5
the answer to how to write 87200 in scientific notation is 8.72*10^4
There are probably about half a dozen ways to write this number in scientific notation, but one way to write it, in scientific notation, is 2.4936061x108.
3000 in scientific notation is 3x103.