1. Fractions Decimals Percentages
Finding a Percentage without a Calculator
Finding a Percentage with a Calculator
Conversion between % Fractions and Decimals
20-Jul-18
Compiled by Mr. Lafferty Maths Dept.

2. Compiled by Mr. Lafferty Maths Dept.
Starter Questions
20-Jul-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.
To understand the process of how to calculate a percentage without a calculator.
Be able to calculate a percentage without a calculator.
20-Jul-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
20-Jul-18
Compiled by Mr. Lafferty Maths Dept.

5. Compiled by Mr. Lafferty Maths Dept.
Percentages
Without a Calculator
20-Jul-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
20-Jul-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
20-Jul-18
Compiled by Mr. Lafferty Maths Dept.

8. 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
20-Jul-18
Compiled by Mr. Lafferty Maths Dept.

9. 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
20-Jul-18
Compiled by Mr. Lafferty Maths Dept.

10. 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
20-Jul-18
Compiled by Mr. Lafferty Maths Dept.

11. Created by Mr. Lafferty Maths Dept.
Percentages
Without a Calculator
Now try TJ N4+
Ex 3.1
Ch3 (page 15)
20-Jul-18
Created by Mr. Lafferty Maths Dept.

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

13. Compiled by Mr. Lafferty Maths Dept.
Percentages
With a Calculator
Learning Intention
Success Criteria
1. We are learning to calculate a percentage of a quantity using a calculator.
To know how to calculate a percentage using a calculator.
Show working.
20-Jul-18
Compiled by Mr. Lafferty Maths Dept.

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

15. Compiled by Mr. Lafferty Maths Dept.
Percentages
With a Calculator
Find 4% of £70
Remember !! money
2 decimal places
20-Jul-18
Compiled by Mr. Lafferty Maths Dept.

16. Created by Mr. Lafferty Maths Dept.
Percentages
With a Calculator
Now try TJ N4+
Ex 3.2
Ch3 (page 16)
20-Jul-18
Created by Mr. Lafferty Maths Dept.

17. Compiled by Mr. Lafferty Maths Dept.
Starter Questions
20-Jul-18
Compiled by Mr. Lafferty Maths Dept.

18. Compiled by Mr. Lafferty Maths Dept.
Percentages
Comparing Percentages
Learning Intention
Success Criteria
1. We are learning to convert a fraction to a percentage and use them in context.
To know how to convert a fraction to a percentage.
Be able to compare percentages in context.
20-Jul-18
Compiled by Mr. Lafferty Maths Dept.

19. 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%
20-Jul-18
Compiled by Mr. Lafferty Maths Dept.

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

21. 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
20-Jul-18
Compiled by Mr. Lafferty Maths Dept.

22. Percentages Now try TJ N4+ Ex 3.3 Ch3 (page 17) www.mathsrevision.com
Have you updated your Learning Log ?
Percentages
Comparing Percentages
Now try TJ N4+
Ex 3.3
Ch3 (page 17)
Are you on Target ?
I can ?
20-Jul-18
Created by Mr. Lafferty Maths Dept.