1. Finding Percentages.
Profits are up by 97%

2. Percentages and fractions.
You should know that :
(1) 50% =
1/2
(2) 25% =
1/4
(3) 75% =
3/4
(4) 10% =
1/10
(5) 20% =
1/5

3. Percentage Calculations.
Calculate the following using the simple fractions equivalents to help you:
(1) 50% of 300 days.
(4) 20% of 45 dogs.
150 days.
9 dogs.
(5) 10% of 240 stars.
(2) 25% of 48 people.
12 people.
24 stars.
(3) 75% of 28 cats.
(6) 30% of 750 boys.
Find 10%
then times
By 3.
21 cats.
225 boys.

4. Calculating Any Percentage.
We can calculate any percentage by knowing how to calculate the percentages below:
(1) 50%
Rule : Divide by 2.
(2) 25%
Rule : Divide by 4.
(3) 10%
Rule : Divide by 10.
(4) 1%
Rule : Divide by 100.

5. Harder Percentage Calculations.
(1) Calculate 42% of £270
Find:
Divide by 10.
10% of £270 =
£27
10% of £270 =
£27
10% of £270 =
£27
10% of £270 =
£27
Divide by 100.
1% of £270 =
£2.70
1% of £270 =
£2.70
Add up all the numbers above.
42% of £270 =
£113.40

6. (2) Calculate 87% of 560 people.
Find :
Divide by 2.
50% of 560 people =
280
½ of 50%
25% of 560 people =
140
10% of 560 people = 56
Divide by 10.
1% of 560 people =
5.6
Divide by 100.
1% of 560 people =
5.6
Add up all the numbers.
87 % of 560 people =
487.2

7. What Goes In The Box ? Calculate the following percentages:
(1) 26% of 400 people.
104
(2) 65% 0f £2800.
1820
(3) 96% of 1200 days.
1152
(4) 39% of 2400 houses.
936