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Using a Calculator Practice Questions

Question 1

3 marks

Use your calculator to work out

12.4+6.83.12−2.7\frac{12.4+\sqrt{6.8}}{3.1^{2}-2.7}

(a)

Write down all the figures on your calculator display.

(b)

Write your answer to part (a) correct to 2 decimal places.

Question 2

2 marks

Use your calculator to work out

8.6cos⁡37∘tan⁡52∘\frac{8.6\cos 37^\circ}{\tan 52^\circ}

Give your answer correct to 3 significant figures.

Question 3

3 marks

Ravi uses his calculator to work out 3.5×0.004823.5\times 0.0048^{2}

This is the number shown on his calculator display.

8.064×10-5

(a)

Write the number shown on the display as an ordinary number.

(b)

Write the number shown on the display correct to 2 significant figures. Give your answer as an ordinary number.

(c)

Ravi then does a different calculation. His calculator display shows 2.45×1072.45\times 10^{7}

Write 2.45×1072.45\times 10^{7} as an ordinary number.