Help! Perform each of the following calculations, expressing the answer w/ the correct number of sig. figs?

Question

*******sig. figs=significant digits/figures

1) 3.458+ 8.52+12.1

2)81.2 - 53.75

3) 101.2 - 57

4) 81.333-58.23

5) 18.72+45.2585

6) 64.35 x 45.2

7) 75.2 x 5.0

8) 4.93 x 1.6 x 2.152

9) 15.5/5.3

10)75.555/3.23

Answer 1

For multiplication and division, the result should have as many significant figures as the measured number with the smallest number of significant figures.

For addition and subtraction, the result should have as many decimal places as the measured number with the smallest number of decimal places.