Question

A poster has a thickness of 1.2 x 10-2 inches.

If two posters are glued together, find the
combined thickness of the posters.

Answer 1

2.4 × 10^-2

Explanation:

You can do a sort of "undistributive" property and factor out the 10^-2 and then add the 1.2+1.2

1.2×10^-2 + 1.2×10^-2

= 10^-2(1.2 + 1.2)

= 10^-2(2.4)

= 2.4 × 10^-2

OR you can change from scientific notation to standard and add them and change back to sci. not. See image.