1.2×10^-1+6.0×10^-2

Answer 1

What you need to do is convert one of the numbers so they are both to the same power of 10. For example,

1.2 x 10^-1 = 12 x 10^-2

Then

(1.2 x 10^-1) + (6.0 x 10^-2) = (12 x 10^-2) + (6.0 x 10^-2) = (12 + 6.0) x 10^-2 = 18 x 10^-2 = 1.8 x 10^-1

You could also convert 6.0 x 10^-2 to 0.6 x 10^-1 and work the problem the same way.