Page 19 - Start Up Mathematics_6

5. 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.

6. There was a stock of 2,75,67,890 sacks of wheat in a godown of Food Corporation of India
(FCI). During drought and flood situations in Odisha and Assam respectively FCI sent
87,89,045 and 96,73,500 sacks of wheat to these states. What is the remaining stock with
FCI?
7. The difference between two numbers is 8,67,593. If the smaller number is 6,34,289, find
the greater number.
8. A container contains 15 L of oil. 345 mL of oil drained out of the container due to leakage.
How much oil is left in the container?

9. The cost of a steel almirah is ` 5,495. What is the cost of 345 such almirahs?
10. The cost of a flat is ` 21,35,690 in a colony. A company decided to purchase 18 such flats
for its executives in the colony. What will be the total expenditure of the company?

11. A Maruti showroom sold 456 Zen cars in the month of March at ` 3,13,495 each. What is
the total sale of the showroom with respect to Zen cars?
12. A student multiplied 8,355 by 89 instead of multiplying by 98. By how much was his
answer less than the actual answer?
13. A steel wire of 100 m is divided into 8 equal pieces. What is the length of each piece?

14. A vessel has 8 L 280 mL of curd. How many bowls each of 1 L 35 mL capacity can be
filled?
15. To stitch a trouser, 1 m 30 cm cloth is needed. Out of 15 m cloth, how many trousers can
be stitched and how much cloth will remain?

Estimation
You might have heard statements like:

• ‘Around nine hundred people enjoyed the music concert.’
• ‘Around thirty thousand people watched the Prime Minister’s speech on YouTube.’

• ‘Around five thousand people gathered for a political meeting.’

In the above examples, the exact number of people present for the particular event is not known.
It is only a general idea about the gathering in each case.
Around nine hundred could be 876 or 908 or around thirty thousand could be 29,034 or 30,136.

If exactly 30,219 workers attended a political meeting, we can say that about 30,000 people were
present for the said meeting. If 193 teachers from Delhi attended a workshop then, it may be said
that about 200 teachers from Delhi attended the workshop. The exact number could be a little
less or more than the number which we have stated. This process of getting a general idea of
the number is called estimation. Estimation of numbers is done to the nearest tens, hundreds,
thousands, ..., i.e., 10, 100, 1,000, ... .

The estimation of numbers is also known as rounding off numbers.

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