1
1 Calculate , giving your answer correct to 4 significant figures.
................................................... [2]
[Total: 2]
2 By writing each number in the calculation correct to 1 significant figure, find an estimate for the value of
................................................... [2]
[Total: 2]
3 Write 6538 correct to the nearest ten.
................................................... [1]
[Total: 1]
4 Write 9876 correct to the nearest thousand.
................................................... [1]
[Total: 1]
5 Sophie buys 73 books for her school.
Each book costs $21.95 .
2
(a) By rounding each number correct to 1 significant figure, estimate the total cost of these books.
$ ................................................... [1]
(b) Write down whether this estimate is greater or less than the exact cost.
Explain how you decide, without working out the exact cost.
.............................. because..............................................................................................................
.......................................................................................................................................................... [1]
[Total: 2]
6 By rounding each number in the calculation correct to 1 significant figure, estimate the value of
You must show all your working.
........................................ [2]
[Total: 2]
7 Tanvi rounds the number 4896.
She writes down 4900.
Rahul says Tanvi rounded 4896 correct to the nearest 100.
Explain why Rahul cannot be certain that Tanvi rounded 4896 correct to the nearest 100.
....................................................................................................................................................................
.................................................................................................................................................................... [1]
[Total: 1]
3
8 Calculate.
Give your answer correct to 3 decimal places.
................................................... [2]
[Total: 2]
9 By writing each number correct to 1 significant figure, find an estimate for the value of
................................................... [2]
[Total: 2]
10 Write 8379 correct to the nearest hundred.
................................................... [1]
[Total: 1]
11 By rounding each number correct to 1 significant figure, estimate the value of
.
You must show all your working.
................................................... [2]
4
[Total: 2]
12 Write 3.72194 correct to 3 decimal places.
................................................... [1]
[Total: 1]
13 Write 16.086 correct to 2 decimal places.
................................................... [1]
[Total: 1]
14 Write 8473 correct to the nearest ten.
................................................... [1]
[Total: 1]
15 Write 0.047 883 correct to 2 significant figures.
................................................... [1]
[Total: 1]
16
(a) By writing each number correct to 1 significant figure, work out an estimate for p.
You must show all your working.
................................................... [2]
(b) Calculate the exact value of p.
................................................... [1]
[Total: 3]
17 Write 3.058 correct to 3 significant figures.
................................................... [1]
[Total: 1]
5
18 Write 1.8972 correct to 2 decimal places.
................................................... [1]
[Total: 1]
19 Write 0.046 875 correct to 2 significant figures.
................................................... [1]
[Total: 1]
20 Without using a calculator, estimate, by rounding each number correct to 1 significant figure,
You must show all your working.
................................................... [2]
[Total: 2]
21 (a) 29 parcels each have a value of $68.
By writing each of these numbers correct to 1 significant figure, find an estimate for the total value of
these 29 parcels.
$ ................................................... [1]
21 (b) Without doing any calculation, complete this statement.
The actual total value of these 29 parcels is less than the answer to part (a)
because ...................................................................................................................................... [1]
6
[Total: 2]
22 Write 0.060 31 correct to 2 significant figures.
................................................... [1]
[Total: 1]
23 Write 257 964 correct to the nearest thousand.
................................................... [1]
[Total: 1]
24 Write these numbers correct to 2 significant figures.
(a) 0.076 499
................................................... [1]
(b) 10 100
................................................... [1]
[Total: 2]
25 Calculate .
Give your answer correct to 1 decimal place.
................................................... [2]
[Total: 2]
26 (a) Calculate , writing down your full calculator display.
................................................... [1]
7
26 (b) Write your answer to part (a) correct to 4 decimal places.
................................................... [1]
[Total: 2]
27 Write 4647 correct to the nearest 100.
................................................... [1]
[Total: 1]
28 Write 0.002 68 correct to 2 significant figures.
................................................... [1]
[Total: 1]
29 Write 4123 correct to 3 significant figures.
................................................... [1]
[Total: 1]
30 Write 209 802 correct to the nearest thousand.
................................................... [1]
[Total: 1]
31 Write 6.8167 correct to 3 significant figures.
................................................... [1]
[Total: 1]
32 (a) Calculate and write down all the figures shown on your calculator.
................................................... [1]
8
32 (b) Write your answer to part (a) correct to 4 decimal places.
................................................... [1]
[Total: 2]
33 Write 3.5897 correct to 4 significant figures.
................................................... [1]
[Total: 1]
34 Write 71 496 correct to 2 significant figures.
................................................... [1]
[Total: 1]
35 Calculate , giving your answer correct to 4 significant figures.
................................................... [2]
[Total: 2]
36 Jamal changes 800 Chinese Yuan into dollars.
The exchange rate is $1 = 6.24 Chinese Yuan.
Calculate the number of dollars he receives.
Give your answer correct to the nearest dollar.
$ ................................................... [3]
[Total: 3]
37 Write 1426.3075 correct to
9
(a) 2 decimal places,
Answer(a) ................................................... [1]
(b) 2 significant figures.
Answer(b) ................................................... [1]
[Total: 2]
38 Write 168.9 correct to 2 significant figures.
Answer ................................................... [1]
[Total: 1]
39 By writing each number correct to 1 significant figure, estimate the value of .
Show all your working.
Answer ................................................... [2]
[Total: 2]
40 By writing each number correct to 1 significant figure, estimate the value of .
Show all your working.
Answer ................................................... [2]
[Total: 2]
