Page 55 - Revised Maths Wisdom Class - 3

Subtracti on of 4-Digit Numbers 53

Exercise 4E

1 Solve the following:

(a) 3415 + 5418 –1634 = ________ (b) 7108 – 5268 + 2103 = ________

(c) 3073 + 2804 – 5355 = ________

2 From the sum of 4097 and 4723, subtract 1796.

3 There were 1875 passengers travelling in a train. Out of these, 325 passengers
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got down and 826 passengers got in at a station. How many passengers are in
the train now?

4 A fruit seller had 1426 bananas. He bought 1056 more bananas from the market and
sold 1563 bananas. How many bananas are left with him?

Estimating the Difference

To quickly check the diff erence, we round off the numbers and subtract them. It can give
us a rough estimate whether our answer is correct or not.

Let's Try

Example 1: Estimate the diff erence of 78 and 52 to the nearest tens.

rounded to Estimated diff erence Actual diff erence
Solution: 78 nearest tens 80 T O T O

8 0 7 8
rounded to
52 nearest tens 50 – 5 0 – 5 2
0
3
2
6
Example 2: Estimate the diff erence of 892 and 720 to the nearest hundreds.

rounded to
Solution: 892 nearest hundreds 900 Estimated diff erence Actual diff erence
H T O H T O
9 0 0 8 9 2
rounded to
720 nearest hundreds 700 – 7 0 0 – 7 2 0
2
7
0
2
1
0