Question

Write 4.9 × 10–8 in decimal notation

Answer 1

0.000000049.

Explanation:

This will have 7 zeros after the decimal point followed by 49:

4.9 × 10^–8 = 0.000000049.

If we imagine the decimal point making jumps to the right over the digits it takes 8 jumps till it gets to 4.9. that's where the -8 comes in.