In this activity, we will find percentages of given amounts!
Recap of common percentages (Make a note of these!)
10% - We divide the amount by 10 because 10% is one tenth
50% - We divide the amount by 2 because it is a half
25% - We divide the amount by 4 because it is a quarter
75% - is three-quarters, so we can divide by 4 and multiply by 3
1% - We divide the amount by 100 because 1% is one hundredth
We can use these simple percentages to find other percentages!
Example 1
Find 20% of 360
Answer
We know how to find 10% - we divide by 10
20% is made up of 2 x 10% (2 lots of 10%)
We can find 10% then multiply by 2
10% = 360 ÷ 10 = 36
20% = 36 x 2 = 72
In this activity, we are looking at problems!
Example
There are 160 students in Year 7.
15% of them come to school by car.
How many students come to school by car?
Answer
We know how to find 10% - we divide by 10
5% is half of 10% (Divide 10% by 2)
We can find 15% by adding 10% and 5% amounts together.
10% = 160 ÷ 10 = 16
5% = 10% ÷ 2 = 16 ÷ 2 = 8
15% = 10% + 5% = 16 + 8 = 24
24 students come to school by car!
Let's try some questions!