1. Fractions Decimals Percentages
Finding a Percentage without a Calculator
(using fractions)
Finding a Percentage without a Calculator
(using other percentages)
Mixed Questions with and without Calculator
12-Jun-18
Compiled by Mr. Lafferty Maths Dept.

2. Compiled by Mr. Lafferty Maths Dept.
Starter Questions
12-Jun-18
Compiled by Mr. Lafferty Maths Dept.

3. Compiled by Mr. Lafferty Maths Dept.
Percentages
Without a Calculator
Learning Intention
Success Criteria
We are learning how to calculate a percentage without a calculator using fractions.
To understand the process of how to calculate a percentage without a calculator using fractions.
Be able to calculate a percentage without a calculator.
12-Jun-18
Compiled by Mr. Lafferty Maths Dept.

4. Compiled by Mr. Lafferty Maths Dept.
Percentages
Without a Calculator
To working out a simple percentage it is easier to
use the fraction equivalent. You should already know
12-Jun-18
Compiled by Mr. Lafferty Maths Dept.

5. Compiled by Mr. Lafferty Maths Dept.
Percentages
Without a Calculator
12-Jun-18
Compiled by Mr. Lafferty Maths Dept.

6. Compiled by Mr. Lafferty Maths Dept.
“of”
means multiple
Percentages
Without a Calculator
Find 25% of £40
1 0 =
= 10
12-Jun-18
Compiled by Mr. Lafferty Maths Dept.

7. Compiled by Mr. Lafferty Maths Dept.
Percentages
Without a Calculator
Find 75% of £300
7 5 =
= 225
12-Jun-18
Compiled by Mr. Lafferty Maths Dept.

8. Percentages 0.75 75% Converting a fraction to a percentage
Comparing Percentages
Converting a fraction to a percentage
Do the division
x 100
Fraction
Decimal
Percentage
Do the division
x 100
0.75
75%
12-Jun-18
Compiled by Mr. Lafferty Maths Dept.

9. Percentages Write the following fractions as percentages.
Comparing Percentages
Write the following fractions as percentages.
= 27%
= 15%
= 29%
12-Jun-18
Compiled by Mr. Lafferty Maths Dept.

10. Compiled by Mr. Lafferty Maths Dept.
Percentages
Comparing Percentages
Paul scored :
24 out of 30 in English and 36 out of 40 in Maths.
By finding the percentage score for each, which is his
best subject ?
English
Maths
12-Jun-18
Compiled by Mr. Lafferty Maths Dept.

11. Created by Mr. Lafferty Maths Dept.
Percentages
Without a Calculator
Now try TJ2b
Ex 1
Ch12 (page 121)
12-Jun-18
Created by Mr. Lafferty Maths Dept.

12. Compiled by Mr. Lafferty Maths Dept.
Starter Questions
12-Jun-18
Compiled by Mr. Lafferty Maths Dept.

13. Compiled by Mr. Lafferty Maths Dept.
Percentages
Without a Calculator
Learning Intention
Success Criteria
We are learning how to calculate a percentage without a calculator using other percentages.
To understand the process of how to calculate a percentage without a calculator using other percentages.
Be able to calculate a percentage without a calculator.
12-Jun-18
Compiled by Mr. Lafferty Maths Dept.

14. Percentages Find 15% of 360 10 % → 36 ÷ 2 ÷ 2 5 % → 18 15 % → 54
Without a Calculator
For more difficult percentages use this method.
Find 15% of 360
10 % → 36
÷ 2
÷ 2
5 % → 18
15 % → 54
12-Jun-18
Compiled by Mr. Lafferty Maths Dept.

15. Compiled by Mr. Lafferty Maths Dept.
Percentages
Without a Calculator
Find 12% of 240
10 % → 24
1 % →
2.4
x 2
x 2
2 % →
4.8
12 % →
28.8
12-Jun-18
Compiled by Mr. Lafferty Maths Dept.

16. Compiled by Mr. Lafferty Maths Dept.
Percentages
Without a Calculator
Find 3.5% of 1200
1 % → 12
x 3
÷ 2
÷ 2
x 3
3 % → 36
0.5 % → 6
3.5 % → 42
12-Jun-18
Compiled by Mr. Lafferty Maths Dept.

17. Created by Mr. Lafferty Maths Dept.
Percentages
Without a Calculator
Now try TJ2b
Ex 2
Ch12 (page 123)
12-Jun-18
Created by Mr. Lafferty Maths Dept.

18. Compiled by Mr. Lafferty Maths Dept.
Starter Questions
12-Jun-18
Compiled by Mr. Lafferty Maths Dept.

19. Compiled by Mr. Lafferty Maths Dept.
Percentages
Without a Calculator
Learning Intention
Success Criteria
We are learning how to calculate a percentage with and without a calculator.
1. Be able to calculate a percentage with and without a calculator.
12-Jun-18
Compiled by Mr. Lafferty Maths Dept.

20. Compiled by Mr. Lafferty Maths Dept.of
means multiple
Percentages
With a Calculator
Find 17% of £450
Remember money
2 decimal places
12-Jun-18
Compiled by Mr. Lafferty Maths Dept.

21. Compiled by Mr. Lafferty Maths Dept.
Percentages
Without a Calculator
20% of the marbles in a bag are yellow.
If there are 130 marbles in the bag
How many are yellow.
10 % → 13
x 2
x 2
20 % → 26
26 marbles are yellow.
12-Jun-18
Compiled by Mr. Lafferty Maths Dept.

22. Percentages Council tax fee will rise by 11% next
With a Calculator
Council tax fee will rise by 11% next
Year. This year it cost £350.
What will it cost next year ? 11
100
X 350 =
£38.50 £
12-Jun-18
Compiled by Mr. Lafferty Maths Dept.

23. Percentages Now try TJ2b Ex 3 Ch12 (page 124) www.mathsrevision.com
Have you updated your Learning Log ?
Percentages
Now try TJ2b
Ex 3
Ch12 (page 124)
Are you on Target ?
I can ?
12-Jun-18
Created by Mr. Lafferty Maths Dept.