# Unit 4 Section 2 : Revision of the four rules (decimals)

This section is intended to act as a revision of basic number operations (+, -, × and ÷) with decimals.
It assumes that you have covered these operations before.

The example question below shows the working using the "traditional" methods for each operation.
There are other methods for each operation which are equally acceptable. You should choose the one you find easiest.

## Example Question

Calculate:
(a) 3.8 + 10.42
(b) 18.2 - 0.36
(c) 8.2 × 3.7
(d) 1.56 ÷ 0.3

Practice Questions
Work out the answer to each of these questions then click on the button marked to see whether you are correct.

(a) What is 21.5 + 3.27?

(b) What is 3.25 - 2.71?

(c) What is 2.41 × 2.3?

(d) What is 1.64 ÷ 0.4?

## 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.

Question 1
 (a) 3.5 + 4.2 = (b) 16.1 + 32.6 = (c) 1.5 + 3.8 = (d) 13.3 + 14.61 = (e) 18.6 + 0.42 = (f) 3.14 + 0.34 =
Question 2
Do these subtractions:
 (a) 6.4 - 2.1 = (b) 27.8 - 13.6 = (c) 3.2 - 0.8 = (d) 8.2 - 4.5 = (e) 6.62 - 0.34 = (f) 8.3 - 6.27 =
Question 3
Do these multiplications:
 (a) 4.3 × 2 = (b) 3.5 × 4 = (c) 7.4 × 6 = (d) 6.2 × 7 = (e) 18.3 × 9 = (f) 5.62 × 5 =
Question 4
Do these divisions:
 (a) 6.8 ÷ 2 = (b) 63.9 ÷ 3 = (c) 52.4 ÷ 4 = (d) 75.5 ÷ 5 = (e) 99.4 ÷ 7 = (f) 151.8 ÷ 6 =
Question 5
Do these mixed questions:
 (a) 12.6 + 8.5 = (b) 76.3 - 18.7 = (c) 20.39 - 15.6 = (d) 17.6 × 4 = (e) 132.7 × 6 = (f) 36.61 ÷ 7 =
Question 6
Do these multiplications:
 (a) 5.6 × 0.3 = (b) 2.3 × 1.5 = (c) 4.8 × 0.21 = (d) 3.4 × 9.4 = (e) 3.6 × 0.72 = (f) 8.2 × 0.91 =
Question 7
Do these divisions:
 (a) 18.6 ÷ 0.3 = (b) 74.5 ÷ 0.5 = (c) 0.36 ÷ 0.02 = (d) 10.5 ÷ 5 = (e) 45 ÷ 0.09 = (f) 0.84 ÷ 0.4 =
Question 8
Do these mixed questions:
 (a) 21.6 ÷ 0.4 = (b) 8.2 - 0.37 = (c) 0.62 × 7 = (d) 3.2 × 0.17 = (e) 8.4 ÷ 8 = (f) 3.7 × 2.01 =

You have now completed Unit 4 Section 2
 Your overall score for this section is Correct Answers You answered questions correctly out of the questions in this section. Incorrect Answers There were questions where you used the Tell Me button. There were questions with wrong answers. There were questions you didn't attempt.
 Since these pages are under development, we find any feedback extremely valuable. Click here to fill out a very short form which allows you make comments about the page, or simply confirm that everything works correctly.