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 = ?
3 x 8.25 = ?
Step 1. Multiply as with whole numbers ignoring the decimal.
Step 2. Count the number of decimal places in the factors.
Step 3. Show the number of decimal places in the product.
Answer: Shabnam has to pay ₹ 24.75.
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.
Step 2. Count the number of decimal places in each factor.