Page 31 - Start Up Mathematics_5

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Solution: Cost of the car = ` 7,25,000

Money spent on accessories = + ` 65,000
Total money spent = ` 7,90,000

Money in the bank = ` 15,00,000
Money spent = – ` 7,90,000

Money left in the bank = ` 7,10,000
So, Rajesh has ` 7,10,000 in his account.

EXERCISE 2.3

1. The population of a country was 5,23,10,725 in 2009. In 2010, due to an earthquake
15,562 people died. In the same year, 8,476 new babies were born. What was the new
population of the country in 2010?

2. A company sold 3,45,20,150 toffees of type A; 2,00,75,800 toffees of type B and
6,00,00,175 toffees of type C. How many toffees did the company sell in all?

3. There are 85,24,650 letters printed in a book. If 82,00,426 are small letters, how many
capital letters are there?
4. The sum of two numbers is 68,47,51,923. If one number is 39,84,60,025, find the other
number.

5. What should be added to 9,07,36,124 to get 21,52,10,015?
6. What number is 10,00,000 more than the largest 8-digit number?

7. What should be subtracted from 59,84,327 to get 36,90,518?
8. What is the difference between the largest 9-digit number and the smallest 7-digit number?

9. What is the smallest number that can be formed using the digits 3, 8, 2, 0, 1, 5, 7 and 6?
10. What is the largest number that can be formed using the digits 1, 2, 0, 4, 0, 7, 3, 1 and 8?

11. Find the difference between the largest number and the smallest number that can be
formed using the digits 6, 2, 8, 0, 9, 4, 0 and 5.
12. Mr Sinha goes with his family for shopping with ` 12,85,750. They purchase a refrigerator
for ` 1,75,000, an LCD TV for ` 96,875, a cooking range for ` 46,790 and a washing
machine for ` 28,925. How much money are they left with?

Multiplication

Let’s revise the properties of multiplication.

Properties of multiplication
1. Commutative property
Two numbers can be multiplied in any order. Their product will remain the same.

For example, 68,751 × 3,125 = 3,125 × 68,751 = 21,48,46,875

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