1. Created by Mr. Lafferty Maths Dept.
Ratios
Ratios
Simplifying Ratios
Ratio Calculations
17-Apr-19
Created by Mr. Lafferty Maths Dept.

2. Created by Mr. Lafferty Maths Dept.
Starter Questions
17-Apr-19
Created by Mr. Lafferty Maths Dept.

3. Created by Mr. Lafferty Maths Dept.
Ratios
What is a ratio ?
Learning Intention
Success Criteria
1. We are learning what a ratio.
Understand the term ratio. .
17-Apr-19
Created by Mr. Lafferty Maths Dept.

4. Ratios www.mathsrevision.com What is a ratio ?
Ratios can be used to compare different quantities
Example : There are 2 triangles and 3 rectangles.
The ratio of triangles to rectangles
is said to be 2 : 3
Note: The ratio of rectangles to triangles is said to be 3 : 2
17-Apr-19
Created by Mr. Lafferty Maths Dept.

5. Created by Mr. Lafferty Maths Department
Ratio
Now try TJ3a
Ex 1
Ch11 (page 96)
17-Apr-19
Created by Mr. Lafferty Maths Department

6. Created by Mr. Lafferty Maths Dept.
Starter Questions
17-Apr-19
Created by Mr. Lafferty Maths Dept.

7. Created by Mr. Lafferty Maths Dept.
Ratios
What is a ratio ?
Learning Intention
Success Criteria
1. We are learning to simplify a ratio.
1. Be able to find the HCF to simplify a ratios.
17-Apr-19
Created by Mr. Lafferty Maths Dept.

8. Ratios www.mathsrevision.com 3 : 4 3 : 7 HCF Highest Common Factor
Simplifying a ratio ?
To simplify a ratio we need to find the HCF
HCF = 2
HCF = 4
÷ 2
÷ 2
÷ 4
÷ 4
3 : 4
3 : 7
17-Apr-19
Created by Mr. Lafferty Maths Dept.

9. Ratios www.mathsrevision.com 13 : 1 16 : 5 18 : 5
Simplifying a ratio ?
To simplify a ratio we need to find the HCF
HCF = 4
HCF = 5
HCF = 4
÷ 4
÷ 4
÷ 5
÷ 5
÷ 4
÷ 4
13 : 1
16 : 5
18 : 5
17-Apr-19
Created by Mr. Lafferty Maths Dept.

10. Created by Mr. Lafferty Maths Department
Ratio
Now try TJ3a
Ex 2
Ch11 (page 98)
17-Apr-19
Created by Mr. Lafferty Maths Department

11. Created by Mr. Lafferty Maths Dept.
Starter Questions
17-Apr-19
Created by Mr. Lafferty Maths Dept.

12. Created by Mr. Lafferty Maths Dept.
Ratios
Ratio Calculations
Learning Intention
Success Criteria
1 We are learning how to do ratio calculations.
Apply tabular method to solve problems involving ratios.
2. Show appropriate working.
17-Apr-19
Created by Mr. Lafferty Maths Dept.

13. Created by Mr. Lafferty Maths Dept.
Ratios
Ratio Calculations
Example : The ratio of boys to girls is 4:5.
If there are 16 boys, how many girls
are there.
boys
girls 4 5
x 4
x 4 16 20
17-Apr-19
Created by Mr. Lafferty Maths Dept.

14. Created by Mr. Lafferty Maths Dept.
Ratios
Ratio Calculations
Example : The ratio of cars to buses is 3:7.
If there are 49 buses, how many cars
are there.
cars
buses 3 7
x 7
x 7 21 49
17-Apr-19
Created by Mr. Lafferty Maths Dept.

15. Ratio Now try TJ3a Ex 3 Ch11 (page 100) www.mathsrevision.com
Have you updated your Learning Log ?
Ratio
Now try TJ3a
Ex 3
Ch11 (page 100)
Are you on Target ?
I can ?
17-Apr-19
Created by Mr. Lafferty Maths Department