Page 138 - Start Up Mathematics_5

Example 14: Subtract ` 2,963.86 from ` 5,048.25.

Solution: ` p
9 11
4 10 14 7 1 15
5 0 4 8 . 2 5
– 2 9 6 3 . 8 6
2 0 8 4 . 3 9

Example 15: Multiply ` 3,165.45 by 15.
Remember
Solution: 3 2 2 2
3 1 6 5 4 5 We multiply and divide

× 1 5 money as we do for
1 1 decimal numbers.
1 5 8 2 7 2 5
+ 3 1 6 5 4 5 0

4 7 4 8 1 7 5

So, ` 3,165.45 × 15 = ` 47,481.75 (place the decimal point 2 digits from the right)
Example 16: Divide ` 2,409.30 by 18.

Solution: 1 3 3 . 8 5 Try These!
18 2 4 0 9 . 3 0
– 1 8 ↓ Divide:
(a) ` 6,247.58 by 41
6 0 (b) ` 2,752.80 by 32
– 5 4 Multiply:
6 9 (a) ` 153.06 by 9
– 5 4 (b) ` 7,918.43 by 25
1 5 3
– 1 4 4
9 0 A Challenge!
– 9 0
0 Find (` 24.62 + ` 94.45) ×
8 ÷ 2 – ` 46.99.
So, ` 2,409.30 ÷ 18 = ` 133.85.

Example 17: Richa purchased 5 bottles of juice and 6 packets of biscuits. The cost of 1
bottle of juice is ` 21.25 and 1 packet of biscuits is ` 9.55. How much did
Richa pay in all?
Solution: Cost of 1 bottle of juice = ` 21.25

Cost of 5 bottles of juice = ` 21.25 × 5 = ` 106.25 Working
Cost of 1 packet of biscuits = ` 9.55 1
1 0 6 . 2 5
Cost of 6 packets of biscuits = ` 9.55 × 6 = ` 57.30 + 5 7 . 3 0

Total cost = ` 106.25 + ` 57.30 = ` 163.55 1 6 3 . 5 5
So, Richa paid ` 163.55 in all.

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