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### Rounding

Decimal Places and Significant Figures

Remember:

- Although the following are discrete questions taken from WJEC examination papers you must also round your answers correctly in several other questions that will be asked in you examination.
- The discrete questions concentrate on rounding to the correct number of significant figures where the other questions will usually require rounding to the correct number of decimal places.

3 (a) Write down 45·3476 correct to 3 significant figures

Ans = 45·3

[1]

(b) Write down 7462 correct to 2 significant figures

Ans = 7500

[1]

6 (a) Write down 839·7 correct to 3 significant figures

Ans = 840

[1]

(b) Write down 0·03426 correct to 2 significant figures

Ans = 0·034

[1]

4 (a) Write down 74·8612 correct to 3 significant figures

Ans = 74·9

[1]

(b) Write down 6·0432 correct to 2 significant figures

Ans = 6·0

[1]

5 (a) Write down 3742 correct to 1 significant figures

Ans = 4000

[1]

(b) Write down 0·06731 correct to 3 significant figures

Ans = 0·0673

[1]

- Write down the following numbers correct to 2 significant figures.
- 0·063732
- 7934

Ans = 0·064

[1]

Ans = 7900

[1]

- Write down the following numbers correct to 2 significant figures.
- 0·00539
- 892

Ans = 0·0054

[1]

Ans = 890

[1]

2 (a) Write down 789·6 correct to 3 significant figures

Ans = 790

[1]

(b) Write down 0·05726 correct to 2 significant figures

Ans = 0·057

[1]

Type the numbers into your calculator:

Remember to put brackets around the numerators and denominators.

(6·7 x 13·1) (3·5 x 4·8) = 5·224404763

Ans = 5·2 to 1 decimal place.

[2]

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