ratio

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Slide 1: Slide
MathematicsLower Secondary (Key Stage 3)

This lesson contains 13 slides, with interactive quizzes and text slides.

time-iconLesson duration is: 10 min

Items in this lesson

ratio

Slide 1 - Slide

Working out Ratios
Ratio is a way in which quantities can be divided or shared.

Example
Share £20 between two people in a ratio of 3:1
A ratio of 3 + 1 = 4 parts, the money needs to be divided into 4 parts.
      20 ÷ 4 = £5  
So 1 person gets  3 x 5 and the other person gets 1 x 5 




Slide 2 - Slide

£20 is divided between Ann and Jim in the ratio 3 : 2​

How much money does each get?​
3 + 2 = 5 parts​


  
 

Slide 3 - Slide

We can simplify Ratios which ratios are pairs? 
6:9
1:10
8:5
1:2
5:10
4:3
7:21
2:3
10:100
24:15
20:15
1:3

Slide 4 - Slide


Write the ratio 15:50 in its simplest form


A
5:10
B
10:25
C
3:10
D
30:100

Slide 5 - Quiz

Sean and Sally share £ 70 in the ratio
6:4
how much did Sally get
A
£7
B
£14
C
£40
D
£28

Slide 6 - Quiz

What is the ratio of boys to girls in this room
A
0:8
B
8:3
C
7:4
D
8:0

Slide 7 - Quiz

What is the ratio 75:25
in its simplest form
A
7:2
B
6:2
C
5:1
D
3:1

Slide 8 - Quiz

Share 56 sweets in the ratio 2 : 5.
A
16:40
B
10:20
C
26:30
D
20:50

Slide 9 - Quiz

Paul shares £600 with his sisters in the ratio 5:3:2
how much did Paul keep
A
£300
B
£250
C
£350
D
£150

Slide 10 - Quiz

Sam and Ronan share their prize money in a ratio of 3:1
if Sam got £45 how much was the prize money altogether
A
£90
B
£60
C
£70
D
£80

Slide 11 - Quiz

Share 150 in the ratio
5:3:2
A
1:5:0
B
10:50:00
C
30:45:75
D
75:45:30

Slide 12 - Quiz

Share 64 in the ratio
4:3:1

A
8:6:2
B
16:12:4
C
32:24:8
D
20:18:8

Slide 13 - Quiz