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
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
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.
Question 2
Find the answer to each of the calculations below.
Question 3
Find the answer to each of the calculations below.
You have now completed Unit 12 Section 1
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Produced by A.J. Reynolds January 2001