Unit 4 Lesson 4: Exercise 3

1) Find the number of significant figure in each of the following:

a)  7.3                b) 162.5m            c) 306 g                  d) 3.57 m                    e) 7.005 kg                                       

f) 0.045 km       g)0. 00234 l      h) 82.030 mg         i) 20.020200 g          j) 60.001

2) Round off each of the following correct up to 3 significant figures:

(a) 56.4517 g                                (b) 5.20763 kg                         (c) 33.311 km                             

 (d) 50.001 cm                            (e) 0.0012485 m                      (f) 0.0013020 l

3) Round off:

(a) 15.256 g correct to three significant figures.

(b) 0.00838 mg correct to two significant figures.

(c) 0.004509 g correct to one significant figures.

(d) 29.404 mm correct to the four significant figures.

(e) 22.311 km correct to the four significant figures.

(f) 3.0921 kg correct to the two significant figures.

4) Write down the value of 17.049 correct to ​

(a) One significant figure,          (b) One decimal place.

5) Express, correct to 2 significant figures, ​

(a) 368.517,                                    (b) 0.060 486.

​ 6) Express, correct to 3 significant figures,

​ (a) 4.718 5,                            (b) 376 490,            (c) 0.003 895 2.

7) Express 403.97 correct to ​

(a) 1 decimal place,      (b) 2 significant figures.

8) Express 578.093 8 correct to ​

(a) 4 significant figures,          (b) The nearest 100,

(c) 2 decimal places,                 (d) The nearest thousandth.

9) Write 904.961 correct to ​
(a) the nearest whole number,    (b) Three significant figures,

(c) Two decimal places

10) Round off
(a) 0.056 75 to 3 decimal places,    ​       (b) 4.952 to 2 significant figures,    ​

(c) $34 597 124 to the nearest $100 000. ​