Page 55 - Start Up Mathematics_4

Solution: Total coins with Tarun and Ravi = 21,618 TTh Th H T O

Number of coins with Tarun = 15,025 1 2 11 1 5 6 11 1 8
Number of coins with Ravi = 21,618 – 15,025

= 6,593 – 1 5 0 2 5
So, Ravi has 6,593 coins. 0 6 5 9 3

Example 17: The sum of two numbers is 3,54,370. If one number is 1,82,756, what is the
other number?

Solution: Sum = 3,54,370 L TTh Th H T O
One number = 1,82,756 2 3 15 5 3 4 13 3 6 7 10 0

Other number = Sum – Given number – 1 8 2 7 5 6
= 3,54,370 – 1,82,756

= 1,71,614 1 7 1 6 1 4
So, the other number is 1,71,614.

Framing Word Problems

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

Example 18: Frame two word problems for 8,750 – 2,375 = ?

Solution: 1. 8,750 jeans were manufactured in a factory. If 2,375 jeans were sold out,
how many jeans were left?
2. Mr Jha deposited ` 8,750 in the bank. He withdrew ` 2,375 in January.
How much money is left in his account?

Addition and Subtraction Together

When a sum contains addition as well as subtraction, first add the numbers that do not have
‘–’ sign in front of them and then add the numbers that have ‘–’ sign and find their difference.

Example 19: 10,129 + 15,372 – 14,013 = ?

1 1
Solution: 1 0 1 2 9 Step 1: Add the numbers that do not have a minus sign in
+ 1 5 3 7 2 front of them.

2 5 5 0 1

9
4 1011
2 5 5 0 1 Step 2: Subtract the number that has a minus sign in front
– 1 4 0 1 3 of it from the sum.

1 1 4 8 8

So, 10,129 + 15,372 – 14,013 = 11,488.

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