﻿ Unit 2 Section 2 : Addition and Subtraction

# Unit 2 Section 2 : Addition and Subtraction

This section deals with the revision of addition and subtraction of both whole numbers and decimals; we also look again at the use of brackets. You are not expected to use a calculator in this section.

## Example 1

Calculate:

 (a) 1142 + 363 (b) 4478 – 227
Note that it is important to line up the numbers with the same place value.

## Example 2

Calculate:

Remember to carry out the calculations in the brackets first.
 (a) 14 – (8 + 3) (b) 16 – (12 – 3)

## Example 3

Calculate:

Remember to line up the decimal points.
 (a) 6.27 + 13.4 (b) 17.6 – 8.31

## Example 4

Ben has £17.50 when he goes out shopping. He spends £1.23 on sweets and £12.99 on a CD.

 (a) How much does he spend in total? (b) How much money does he have left?

## 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
Calculate:
 (a) 16 + 47 (b) 32 + 18 (c) 19 + 15 (d) 66 + 82 (e) 37 + 92 (f) 44 + 126 (g) 572 + 116 (h) 362 + 97 (i) 421 + 362 (j) 46 + 712 (k) 381 + 56 (l) 182 + 1141
Question 2
Calculate:
 (a) 66 – 4 (b) 78 – 3 (c) 49 – 7 (d) 72 – 21 (e) 47 – 25 (f) 88 – 36 (g) 41 – 22 (h) 83 – 47 (i) 76 – 57 (j) 121 – 92 (k) 742 – 151 (l) 311 – 286
Question 3
Calculate:
 (a) 3.6 + 4.2 (b) 5.7 + 1.2 (c) 6.3 + 2.6 (d) 13.2 + 1.2 (e) 3.72 + 4.1 (f) 8.1 + 13.24 (g) 3.6 + 1.724 (h) 8.14 + 19.7 (i) 11.2 + 16.31
Question 4
Calculate:
 (a) 4.7 – 2.4 (b) 8.6 – 6.5 (c) 3.9 – 1.4 (d) 4.92 – 1.81 (e) 6.91 – 2.3 (f) 4.7 – 2.19 (g) 3.7 – 2.17 (h) 14.2 – 9.08 (i) 5.6 – 4.72
Question 5
Calculate:
 (a) 20 – (6 + 2) (b) 14 – (8 – 2) (c) 18 – (3 + 1) (d) 100 – (37 – 22) (e) 18 – (11 + 4) (f) 22 – (11 + 1) (g) 144 – (80 + 12) (h) 66 – (5 + 17) (i) 100 – (15 – 9) (j) 200 – (101 + 42)
Question 6
Fill in the missing numbers:
 (a) 962 – = 476 (b) – 128 = 415 (c) 3612 =+ 43 (d) 7526 =– 78
Question 7
Write one number at the end of each calculation to make it correct:
 (a) 400 + 150 = 500 + (b) 14 + 6 = 4 + (c) 37 – 20 = 27 – (d) 38 + 17 = 28 + (e) 38 – 17 = 28 – (f) 54 – 26 = 14 +
Question 8
There are 32 pupils in class 7DC, 28 pupils in class 7BD and 29 pupils in class 7PD.
How many pupils are there altogether in these 3 classes?
pupils
Question 9
There are 74 people on a bus. At one stop 22 people get off. How many people are left on the bus?
people
Question 10
Ben spends £4.27 in one shop and £15.99 in another shop.

(a) How much does he spend altogether?

(b) If he started with £25, how much money does he have left?

Question 11
Bella buys a value burger meal that costs £3.28 for herself and a fun meal that costs £2.25 for her sister.

(a) How much does she spend altogether?

(b) How much change should she get from a £10 note?

Question 12
A triangle has sides of length 18.8 cm, 14 cm and 12.75 cm. Calculate the perimeter of the triangle.

P:cm

Question 13
Look at these number cards:
 +3 0 –5 +9 +2 –8 +7 –2

(a) Choose a card to give the answer 4.

 +2 + –5 + = 4

(b) Choose a card to give the lowest possible answer.

 –2 + =

(c) Choose a card to give the lowest possible answer.

 –2 – =

(d) Now choose a card to give the highest possible answer.

 –2 – =