Page 115 - Math Skill - 4

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Multiplication and Division of Money
We do the multiplication and division of money just Fact-o-meter
as we do in case of numbers. Always remember to When multiplying or dividing
carry over from the paise column whenever we cross money, place the decimal point at
100 p (= ` 1 carried over). two places from right.

Let’s Attempt
Example 1: The price of one pen is ` 4.25. How much money should I pay for 6 such pens?

Solution: Price of one pen = ` 4.25 1 3

Price of 6 pens = ` 4.25 × 6 × ` 4 . 2 5
6
Thus, I need to pay ` 25.50 to buy 6 pens. ` 2 5 . 5 0

Example 2: Kishor bought 3 notebooks, each of which costs ` 24.75. He paid a 100-rupee
note to the shopkeeper. Find the amount he is supposed to get back from the
shopkeeper.
1 2 1
Solution: Cost of 1 notebook = ` 24.75 ` 2 4 . 7 5

Cost of 3 notebooks = ` 24.75 × 3 × 3
So, the cost of 3 notebooks = ` 74.25 ` 7 4 . 2 5
Amount returned by the shopkeeper 0 9 9 9 10
` 1
= ` 100.00 – ` 74.25 = ` 25.75 – ` 0 0 . 0 0
4 . 2
7
5
Thus, the shopkeeper returns him ` 25.75. ` 2 5 . 7 5
Example 3: The cost of 6 books is ` 844.20, then what will be the cost 1 4 0 .7 0
of one such book? 6 8 4 4 .2 0
–6
Solution: Cost of 6 books = ` 844.20
2
Cost of 1 book = ` 844.20 ÷ 6 – 2 4
4
= ` 140.70 0 4 2
Thus, the cost of one book = ` 140.70 – 4 2
0

Example 4: The cost of 9 paintings is ` 679.50. If all the paintings
have same price, find the cost of 1 painting. 7 5 .5 0
9 6 7 9 .5 0
Solution: Cost of 9 paintings = ` 679.50 –6 3

So, cost of 1 painting = ` 679.50 ÷ 9 4 9
= ` 75.50 –4 5
Thus, cost of 1 painting is = ` 75.50. 4 5
–4 5
0