Exercise No. 4C

NOTE: Answers to all questions are given at the end of this exercise.

Question No. 1:

Round off the following:

(a) 456g to the nearest 10g.

(b) 722g to the nearest 100g.

(c) 3.27cm to the nearest cm.

(d) 123.452cm to 1 decimal place.

(e) 18.2 to nearest whole number.

(f) 31.256m to the nearest 10 m.

(g) 12.35cm to the nearest 0.1 cm.

(h) 4325 pupils to the nearest 100 pupils.

(i) 845km to the nearest 10km.

(j) 22.58 mm to the nearest 1/10mm.

 

NOTE: Answers to all questions are given at the end of this exercise.

Question No. 2:
State the number of significant figures in each of the following:

NOTE: Answers to all questions are given at the end of this exercise.

Question No. 3:
Express the following numbers correct to the number of significant figure indicated within the bracket:

NOTE: Answers to all questions are given at the end of this exercise.

Question No. 4:
(a) Estimate the value of 7.94/2.01 correct to 1 significant figure.
(b) use your result to estimate the value of 79400/0.000201

NOTE: Answers to all questions are given at the end of this exercise.

Question No. 5:
Estimate the value of 21.83 x 0.498/220.1, giving your answer correct to 3 significant figures.

NOTE: Answers to all questions are given at the end of this exercise.

Question No. 6:
Express 28.136275 correct to two significant figures. How many decimal places are there in the result?

NOTE: Answers to all questions are given at the end of this exercise.

Question No. 7:
Express 0.21108794 correct to three significant figures. Write down the number of decimal places in the result.

NOTE: Answers to all questions are given at the end of this exercise.

Question No. 8:
Express 0.0083457 correct to four decimal places. State the number of significant figures in the answer?

NOTE: Answers to all questions are given at the end of this exercise.

Question No. 9:
Express 117.9648 correct to four decimal places. How many significant figures are there in the answer?


Answers

(from left to right)

4c-i 4c-ii 4c-iii 4c-iv

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