Page 57 - Start Up Mathematics_3

Solving Word Problems

Let’s learn how to solve word problems on subtraction.

Example 11: In a school there are 2975 students. If 1682 students
are girls, how many boys are there?

8 17
Solution: Total students = 2 9 7 5

Number of girls = – 1 6 8 2
Number of boys = 1 2 9 3

There are 1293 boys in the school.

Example 12: Vishu had ` 15650. He bought a TV set for ` 9865. How much money
is he left with?
14 15 14
0 4 5 4 10
Solution: Total money Vishu had = ` 1 5 6 5 0

Money spent on the TV = – ` 9 8 6 5
Money left with Vishu = ` 5 7 8 5

Vishu is left with ` 5785.

Framing Word Problems

For a given subtraction fact, we frame word problems in the same manner as we do
for an addition fact.

Example 13: Frame 3 word problems for 35 – 15 = ?

Solution: Word problems for this fact can be as follows:
1. Rahul has 35 chocolates. He gives 15 chocolates to his friends. How

many is he left with?
2. In a class, there are 35 students. On a certain day, 15 students of

the class were absent. How many students were present that day?
3. Christopher invited 35 friends to his birthday party. 15 of them
were girls. How many boys did he invite?

EXERCISE 4.4

1. Subtract the following using estimation to the nearest 100 and compare with

the actual value.
(a) 3742 from 6483 (b) 5216 from 8479

(c) 2807 from 5731 (d) 1775 from 3120

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