Page 10 - ACE YR IGCSE A TOP APPR' TO MATHS

8 Calculate 3.54 × 10 × 0.0354 and correct your answer to the nearest thousand.
5

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3 √569
9 Calculate . Give your answer correct to 2 significant figures.
4.1 (9.03 + 3.2 )
3
2
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10 It is given that 1 = 1 – 1 .
a b c
(a) Find the value of c when a = 3.5 × 10 and b = 3.145 × 10 . Give your answer in 3 decimal places.
3
–2

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(b) Write c in terms of a and b.

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11 Sebastian is cycling along Parkview Garden. The diameter of each wheel of his bicycle is 50 cm and each
wheel makes 100 revolutions a minute. Calculate the distance, in km to 3 decimal places, travelled by
Sebastian in 0.6 hours.

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Standard form

1 Given that A = 3.51 × 10 , B = 2.6 × 10 , C = 8.01 ×10 , evaluate the following expression and write your
–2
4
–1
answer to the nearest whole number.
(a) 2A – B + C

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Chapter 1A Numbers 5

Chapter 1A.indd 5 15/03/2022 10:26 AM