# To Calculate a Number when its Percentage is Known | How to Calculate an Unknown if you know the Amount of Percent?

In 5th grade math, there are several topics that we have discussed earlier. In this article, we are going to focus on how to calculate a number when its percentage is known. So, the students who are lagging behind the concept of percentage and its conversions can make of this article and enhance their math skills. In order to calculate the percentage, you have to understand the question first and then try to solve the problem. Here the 5th grade students can find the simplest methods to calculate a number when the percentage is known with the help of solved problems.

Do Refer:

## What is meant by Percentage?

The terms’ percent and percentage are used in many situations. In math, a Percentage is a number or ratio which can be represented as a fraction of 100. The symbol of percentage is %.

### Problems to Calculate a Number when its Percentage is Known

Let us discuss with some examples regarding how to calculate a number when its percentage is known. You can see some word problems for calculating a number when its percentage is known.

Example 1.
Marvel scored 10% out of 840 marks how many marks did he scored?
Solution:
Given that,
Marvel scored are 10% out of 80
10/100 Ã— 840
Then we get 84
Therefore, the total number of marks that Marvel scored is 84%

Example 2.
On the day 30% of 80 people in the colony are going shopping. Find how many people went shopping?
Solution:
Given,
People went for shopping is 30% of 80
30/100 Ã— 80
Then we get 24
Thus, People went for shopping are 24%

Example 3.
28% of 180 baskets are filled with apples. Find how many baskets are filled?
Solution:
Given that,
Baskets are filled with apples are 28% of 180
20/100 Ã— 180
Then we get 50.4
Thus the total number of baskets filled with apples is 50.4%

Example 4.
Jerry scored 80% of 360 marks in maths subject. How many marks did he score in maths?
Solution:
Given that,
Jerry scored 80% of 360
80/100 Ã— 360
Then we get 288
Thus, Jerry scored in maths = 288%

Example 5.
In a class 14% of 92 students were present. Find the number of students is absentees?
Solution:
The number of students in a class is 14% of 92
14/100 Ã— 92
Then we get 14
Total number of students in a class =92
Total number of students present in a class = 14
92 – 14 = 78
Therefore the total number of students absent = 78

Example 6.
In my family, 3% of 10 people are going to the supermarket. Find the number of people who went to the supermarket?
Solution:
The total number of persons in my family is 2% of 10.
2/100 Ã— 10
Then we get 5
The total number of persons in my family is 10
The total number of persons went to the supermarket is 5
The remaining 5 people are left in my family to went to the supermarket.

Example 7.
On one day 10% of 200 cars are move to servicing. How many cars are not going to the servicing and find how many went for servicing?
Solution:
Cars moved to the servicing are 10% of 200
10/100 Ã— 200
Then we get 20
The total number of cars that went to servicing is 20
The total number of cars that not went to servicing is 200 – 20 = 180

Example 8.
Mari takes 40% of 80 pens and he has given 1 pen to his friend. Find how many pens are with him?
Solution:
Mari takes pens is 4% of 80
40/100 Ã— 80
Then we get 32
The total number of pens with Mari is 32
And one pen is given to his friend
Therefore 32 – 1 = 31
The total number of pens with Mari is 31

Example 9.
Jonny makes 5% of 25 runs in cricket. Find how many runs he did
Solution:
Given,
Jonny makes runs in cricket is 5% of 25
5/100 Ã— 25
Then we get 1.25
Therefore Jonny makes 1.25 runs in cricket.

Example 10.
On a rainy day, 30% of 130 students are going to school. Find how many students went to school and how many are absentees.
Solution:
Given,
On a rainy day, the number of students went to school is 30% of 130
30/100 Ã— 130
Then we get 39
Total number of students went to school on a rainy day is 39
The total number of students are absent the school on a rainy day is 130 – 39 = 91
Thus 91 students are absent from school on a rainy day.

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