Page 41 - Start Up Mathematics_3

Expanded form
(c) Th H T O Th H T O
4 3 6 2 + + +

+ 1 5 4 7 + + +

+ + +
+

2. Write in expanded form and add.
(a) 6325 + 3784 (b) 5637 + 2983 (c) 7845 + 2930 (d) 3620 + 2048

3. Estimate the following sums by rounding off the addends as mentioned.

(a) 4627 + 3781 + 1215 (to the nearest hundred)

(b) 2875 + 6496 + 1324 (to the nearest thousand)

Solving Word Problems

Example 5: Sukhpreet deposited ` 4550 in his account on Monday. He deposited
` 2765 on Wednesday and ` 3096 on Friday. How much money did he

deposit in his account by Saturday?
1 2 1
Solution: Money deposited on Monday = ` 4 5 5 0
Money deposited on Wednesday = ` 2 7 6 5

Money deposited on Friday = ` 3 0 9 6

Total money in his account by Saturday = ` 1 0 4 1 1

Sukhpreet deposited ` 10411 by Saturday in his account.

Framing Word Problems

So far we have learnt how to solve word problems. Now, we will learn how to frame
word problems.

Example 6: Frame 3 word problems for 19 + 35 = _______.

Solution: Word problems for the given fact can be as follows:

1. 19 boys and 35 girls participated in an interschool competition.
How many children participated in the competition?

2. Kirti has 19 marbles. Her friend Chinki gives her 35 marbles more.
How many marbles does Kirti have now?

33