Finding the whole given a percentage

Question 1

When given a percentage and it’s value, how do we find the whole amount?

20% is $2

100% = ?

Answer 1

We divide the percentage value to find what 1% is and then we multiply by 100 to find the whole amount

1% is $2/20 =$0.1

100% is $0.1 * 100 = $10

Question 2

Given

20% is $4

100% = ?

Answer 2

1% is $4/20 =$0.2

100% is $0.2 * 100 = $20

Question 3

Given

40% is 4 kg

100% = ?

Answer 3

1% is 4kg/40 = 0.1 kg

100% is 0.1 kg * 100 = 10 kg

Question 4

Given

10% is 50 cm

100% = ?

Answer 4

1% is 50 cm/10 = 5 cm

100% is 5 cm * 100 = 500 cm

Question 5

6 students in a class are girls. If they form 30% of the class, how many students are there in the class?

Answer 5

30% is 6

1% is 6/30 = 1/5

100% is 1/5 * 100 = 20

There are 20 students in the class

Question 6

John spends 20% of his allowance on food. If he spends $5 on food, what is his allowance?

Answer 6

20% is $5

1% is $5/20 = $0.25

100% is $0.25 * 100 = $25

His allowance is $25