Page 38 - ICSE Math 5

Solution: Actual Value Estimated Value
6 14 4 12 6 14
7 4 5 2 3 6 7 4 5 0 0 0
– 4 6 3 8 1 5 – 4 6 4 0 0 0

2 8 1 4 2 1 2 8 1 0 0 0

The actual value 2,81,421 when rounded off to the nearest 1,000 is 2,81,000.
So, the estimated value is correct.

Word Problems on Subtraction

Example 15: The sum of two numbers is 3,54,370. If one number is 1,82,756, what is the other
number?

Solution: Sum of two numbers = 3,54,370 Calculation
2 15 3 13 6 10
One number = 1,82,756 3 5 4 3 7 0
– 1 8 2 7 5 6
Other number = Sum – Given number
1 7 1 6 1 4
= 3,54,370 – 1,82,756

= 1,71,614

So, the other number is 1,71,614.

Example 16: Rajesh had ` 15 lakh in his bank account. He purchased a car for ` 7 lakh 25 thousand.
He spent ` 65,000 to buy some accessories for the car. How much money does he
have in his bank now?

Solution: Total money Rajesh had in his bank account

= ` 15,00,000 Calculation
1
Money spent on purchasing a car = ` 7,25,000 7 2 5 0 0 0
+ 6 5 0 0 0
Money spent on buying accessories = ` 65,000 7 9 0 0 0 0

 Total money spent on car and accessories

= ` (7,25,000 + 65,000)

= 7,90,000

Thus, money left in Rajesh’s account after
Calculation
spending on car and some accessories 14
0 4 10
= ` (15,00,000 – 7,90,000) 1 5 0 0 0 0 0
– 7 9 0 0 0 0
= ` 7,10,000 7 1 0 0 0 0

So, Rajesh has ` 7,10,000 in his bank account.

28