Page 75 - Math Skill - 5

Fractions 73

(e) 7 of 60 (f) 2 3 of 40 (g) 13 of 100 (h) 3 of 3 2
12 10 10 4 3
4. Complete the following.

1 7 69
(a) of ` 1 = _____ (b) of ` 50 = ` _____ (c) of a kg = _____ g
4 10 100
4 3 3
(d) of 1 m = _____ cm (e) of 60 L = _____ L (f) of 80 km = _____ km
5 15 16

Word Problems

Let’s Attempt

4
Example 1: A bag contains 37 kg of grains. How much grains do 8 such bags will have?
5
4
Solution: Quantity of grains in one bag = 37 kg = 189 kg
5 5
189 1512 2
Quantity of grains in 8 such bags = × 8 = = 302 kg
5 5 5
Hence, 8 bags will have 302 2 kg of grains.
5 1
Example 2: Find the perimeter of a rectangular field whose length and breadth are 12 m
3 2
and 8 m, respectively.
4 Fact-o-meter
1
Solution: Length of the rectangular field = 12 m = 25 m
2 2 When we do any operation
3 35 we should keep the unit of
Breadth of the rectangular field = 8 = m all quantities same.
4 4
Perimeter = 2 × (length + breadth)

 2 5 35 ( 25 2× ) ( 351× )   50 35+ 
+
= 2 ×  2 + 4  m = 2 ×  4  = 2 ×  4 






1 85 85 1
= 2 × = = 42 m
4 2 2
2 1
Hence, the perimeter of the field is 42 m.
2
Exercise 5.8

2
1
1. Namita can walk 3 km in an hour. How much distance will she cover in 2 hours?
5 3
1
1
2. A kilogram of oranges costs ` 43 . What is the cost of 3 kg of oranges?
2 5