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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.

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Rounding

Rounding

Decimal Places and Significant Figures


Remember
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]


Ans = 0·064

[1]

Ans = 7900

[1]


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]


correct to 1 decimal place

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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