Chapter 3 Practice #1 Name ____________________________________

1. Complete the table below by writing the rules for counting zeros as significant figures or not counting them. Then supply 2 examples of that demonstrate that rule rule.

Rule for counting zero

Example 1

Example 2

2. Explain why the following statements are true.

A. The measurement 90.7 g has three significant figures.

B. The measurement 0.0742 L has three significant figures.

C. The measurement 18200 m has three significant figures.

D. The measurement 18.200 seconds has five significant figures.

3. Write the number of significant figures in the following measurements.

_____ A. 2.708

_____ B. 50.007

_____ C. 0.00045

_____ D. 589000

_____ E. 50800

_____ F. 789.006

_____ G. 507.7800

_____ H. 0.00480

_____ I. 540300

_____ J. 287.345

_____ K. 16.3050

_____ L. 3000010

_____ M. 0.00458

_____ N. 6.38 x 10⁹

_____ O. 4.678 x 10²²

_____ P. 3.67 x 10^-4

_____ Q. 0.000000875

_____ R. 3322.008

_____ S. 4506.003

_____ T. 56.000

_____ U. 30.230

4. Round 80.45 to

a) 3 significant figures b) 2 significant figures c) 1. significant figure

5. Round the following numbers to three significant figures

_____________ A. 50.63

_____________ B. 1823

_____________ C. 1.823 x 10³

_____________ D. 08129

_____________ E. .004536

_____________ F. 4.5636 x 10^-3

_____________ G. 12.98

_____________ H. 13.02

_____________ I. 129.8

_____________ J. 1.2046

_____________ K. 120.46

_____________ L. 12.04

6. Use your calculator to answer the following.

A. 2.345 + 6.487 = F. 68.439 - 54.1 =

B. 2.7 x 10⁴ + 3.67 x 10⁴ = G. 7.8 x 10⁶ - 2.4 x 10⁵ =

C. 8.4 x 10^-4 + 6.89 x 10^-4 = H. 2.7 x 10^{-4 -} 3.67 x 10^-5 =

D. 456 x 21 = I. 3200 x 460 =

E. J.

8. Which of these rulers could have been used to measure the following distances?

_____ A. 2.7 cm _____ B. 3 cm _____ C. 2.72 _____ D. 10.1 _____ E. 11.2 _____ F. 6.72 _____ G. 10.74	I.
	II.
	III.