Tuesday , July 5 2022
Mathematics

NCERT 5th Class (CBSE) Mathematics: Percentage

FINDING PERCENTAGE

A. Finding the percentage as a number

(a) Arjun’s mother bought a pair of shoes for him at a sale. The shoes coast Rs. 300, but she got it at 25% less than that. How much money did she save?

We need to find 25% of Rs. 300

Step 1. Write the per cent as a fraction: 25/100

Step 2. Multiply by the quantity: 25/100 × 300 = 75

Answer: Arjun’s mother saved Rs. 75.

(b) What is 4% of 60 meters?

Finding Percentage

B. Finding What per cent one number is of another

(a) Ankita got Rs. 225 from making and selling Diwali card during the school fete. She spent Rs. 90 on buying a present at the fete for her mother. What percentage of her money did she spend?

To find what per cent 90 is of 225:

Step 1. Express 90 out of 225 as a fraction → 90/225

Step 2. Change the fraction into a percentage by multiplying by 100 → 90/225 ×  100 = 40%

Answer: Ankita spent 40% of what she earned on buying a present for her mother.

(b) What per cent is 50 g of 1 kg?

Step 1. Make both the units same → 1 kg = 1000 g

Step 2. Express 50 g out of 1000 g as a fraction → 50/1000

Step 3.Change the fraction to a percentage by multiplying by 100 → 50/1000 × 100 = 5%

Answer: 50 g is 5% 0 1 kg

(c) What per cent is 1 week of 1 month?

(Take one month to have 30 days.)

1 week = 7 days

1 month = 30 days

Finding Percentage-1

CHECKPOINT: Use the same units while finding percentages.

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