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# Percentages without a calculator

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by

## Mr Mattock

on 20 June 2016

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#### Transcript of Percentages without a calculator

Percentage without a calculator
Percentage problems
Example
L.O. - To calculate percentages without a calculator.
Percent Cloud
100% =
10% =
20% =
50% =
25% =
5% =
1% =
2% =
1) 10 children
2) £45
3) 160 oranges
4) 16 pupils
5) 36 pupils
6) 66 books
120
Percent Cloud
100% =
10% =
20% =
50% =
25% =
5% =
1% =
2% =
120
1.2
12
24
6
60
30
2.4
Percentage problems
20% = 5 pupils
60% = 5 x 3 = 15 pupils
OR
50% = 12.5 pupils
10% = 2.5 pupils
60% = 12.5 + 2.5 = 15 pupils
OR
10% = 2.5 pupils
60% = 2.5 x 6 = 15 pupils
Example
10% = 70 pupils
2% = 14 pupils
12% = 70 + 14 = 84 pupils
OR
2% = 14 pupils
12% = 14 x 6 = 84 pupils
OR
4% = 28 pupils
12% = 28 x 3 = 84 pupils
OR
1% = 7 pupils
12% = 7 x 12 = 84 pupils
Activity
Complete the worksheet without using a calculator.
Plenary
Calculate 213% of 150
(Hint 213 = 100 + 50 + 25 + 20 + 10 + 5 + 2 + 1)
Plenary
Calculate 213% of 150
(Hint 213 = 100 + 50 + 25 + 20 + 10 + 5 + 2 + 1)
100% = 150
50% = 75
25% = 37.5
20% = 30
10% = 15
5% = 7.5
2% = 3
1% = 1.5
150 + 75 + 37.5 + 30 + 15 + 7.5 + 3 + 1.5 = 319.5
Key
Examples

Activity