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5th Class (CBSE) Mathematics: Decimals

Multiplication Of Decimals

A. Multiplying Decimals by a Whole Number

a) A greeting card costs ₹ 8.25. If Shabnam buys three cards, how much should she pay the shopkeeper?

8.25 + 8.25 + 8.25 = ?

Or

3 x 8.25 = ?

Step 1. Multiply as with whole numbers ignoring the decimal.

multiplication of decimal

 

Step 2. Count the number of decimal places in the factors.

multiplication of decimal

 

Step 3. Show the number of decimal places in the product.

multiplication of decimal

 

 

 

Answer: Shabnam has to pay ₹ 24.75.

multiplication of decimal

 

B. Multiplying a Decimal by a Decimal

a) Sapna wants to find out the area of her new carpet. She knows she can find that by multiplying the length and the breadth of the carpet.

1.8 m x 0.6 m = ?

Step 1. Multiply as in whole numbers ignoring the decimal point.

multiplication of decimal

 

Step 2. Count the number of decimal places in each factor.

multiplication of decimal

 

 

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