Page 23 - ICSE Math 6

Operations on Large Numbers

In previous classes, we have solved many problems involving addition, subtraction, multiplication
and division. Let’s solve some more problems based on these operations.

Example 11: Last month, Royal bookstore sold books worth ` 3,85,891 in the first week and worth
` 4,00,768 in the second week. How much was the sale for the two weeks together? In
which week was the sale greater and by how much?

Solution: Sale during the first week = ` 3,85,891 ` 3,85,891
Sale during the second week = ` 4,00,768 + ` 4,00,768
Total sale for the two weeks together = ` 3,85,891 + ` 4,00,768 ` 7,86,659
= ` 7,86,659
Therefore, the sale for two weeks together was ` 7,86,659.
The extreme left digit of the number representing sale of the
second week is greater than that of the first week. Therefore, ` 4,00,768
the sale in the second week is greater. – ` 3,85,891
In the second week, the sale is greater by = ` 4,00,768 – ` 3,85,891 ` 14,877
= ` 14,877
Example 12: On an average, a machine manufactures 3,215 screws in a day. How many screws will
it produce in the month of January?
3,215
Solution: Average number of screws machine manufactures in a day = 3,215 × 31

Number of days in the month of January = 31 3,215
Number of screws machine will produce in the month of January + 9,645X
= 3,215 × 31 = 99,665 99,665
Therefore, the number of screws machine will produce in the month
of January is 99,665.
Example 13: To stitch a shirt, 2 m 15 cm cloth is needed. Out of 40 m cloth, how many shirts can
be stitched and how much cloth will remain?
Solution: Cloth required to stitch a shirt = 2 m 15 cm = 215 cm ( 1 m = 100 cm)
Total cloth available for stitching shirts = 40 m
= 4,000 cm 215 4,000 18
Number of shirts that can be stitched – 215
1,850
= 4,000 cm ÷ 215 cm – 1,720

Since the quotient is 18 and the remainder is 130 therefore, 18 130
shirts can be stitched and 130 cm or 1 m 30 cm cloth will remain.

EXERCISE 1.3

1. A businessman earned a profit of ` 2,34,561 in the month of January, ` 1,95,467 in the month of
February and ` 3,44,560 in the month of March. How much profit did he earn in these months?
2. The population of a city is 30,54,678. If the number of males in the city is 17,11,987, find the
number of females in the city.
3. There was a stock of 2,75,67,890 sacks of wheat in a godown of Food Corporation of India (FCI).
The FCI sent 87,89,045 and 96,73,500 sacks of wheat to Odisha and Assam respectively. What is
the remaining stock with FCI?

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