Unit 12 Section 1 : Arithmetic with Whole Numbers and Decimals

This section gives you the opportunity to practise some of the arithmetic skills you learnt in earlier units.

Example Questions

Below are some examples of questions with solutions given alongside.
Question
Answer and Explanation
3.4 + 4.75
 8.15 you can write this as remembering to keep the decimal points lined up
49 × 10
 490 shift the decimal point one place to the right and add in a zero
47.3 × 100
 4730 because 47.3 × 100 = 47.3 × 10 × 10 so we shift the decimal point two places to the right
52 ÷ 10
 5.2 shift the decimal point one place to the left
7.41 ÷ 100
 0.0741 because 7.41 ÷ 100 = 7.41 ÷ 10 ÷ 10 so we shift the decimal point two places to the left
3.6 × 4
 14.4 because
909 ÷ 3
 303 because

 

Exercises

Work out the answers to the questions below and fill in the boxes. Click on the Click this button to see if you are correct button to find out whether you have answered correctly. If you are right then will appear and you should move on to the next question. If appears then your answer is wrong. Click on to clear your original answer and have another go. If you can't work out the right answer then click on Click on this button to see the correct answer to see the answer.

You will be able to do some of these questions in your head, but you may need to write down working for others.
Do not use a calculator for any of these questions.

Question 1
Find the answer to each of the calculations below.

(a) 124 + 32
 (b) 1047 + 189
 (c) 3.24 + 5.63
(d) 18.7 - 2.6
 (e) 1627 - 315
 (f) 1742 - 351
(g) 37 + 120
 (h) 157 + 36
 (i) 4.72 + 3.6
(j) 6.4 + 8.21
 (k) 3.56 + 8.24
 (l) 6.3 + 8.71
(m) 16.4 + 3.2
 (n) 18.8 - 7.3
 (o) 17.4 - 8.25

Question 2
Find the answer to each of the calculations below.

(a) 37 × 10
 (b) 4.71 × 10
 (c) 8.62 × 10
(d) 57 × 100
 (e) 8.71 × 100
 (f) 8.2 × 1000
(g) 117 ÷ 10
 (h) 84 ÷ 10
 (i) 18.92 ÷ 10
(j) 84 ÷ 100
 (k) 8.72 ÷ 1000
 (l) 0.421 ÷ 10
(m) 8.201 × 1000
 (n) 52.3 ÷ 1000
 (o) 18.62 ÷ 10

Question 3
Find the answer to each of the calculations below.

(a) 88 × 12
 (b) 42 × 17
 (c) 56 × 14
(d) 848 ÷ 4
 (e) 738 ÷ 6
 (f) 924 ÷ 4
(g) 64.7 × 7
 (h) 3.8 × 5
 (i) 19.2 × 5
(j) 8 × 16.4
 (k) 7 × 3.21
 (l) 5 × 8.47
(m) 5.7 × 0.8
 (n) 3.61 × 0.4
 (o) 3.2 × 2.4

You have now completed Unit 12 Section 1
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Produced by A.J. Reynolds January 2001