Text Book Back Exercises Questions with Answers, Solution : 5th Maths : Term 3 Unit 3 : Measurements : Exercise 3.2 (Finding volume using water, unit cubes)

**Exercise
3.2**

** **

**1. Volume of regular solids such as
cube and cuboid can be found by multiplying the dimensions. Complete the given
table by finding the volume of the given objects. **

^{ }_{ }

** **

**2. Complete the given table by finding
the volume of the given objects.**

1. Volume =* l *× b × h

V =6 × 8 × 10

**V = 480 cm ^{3}**

2. Volume =* l *× b × h

900 = 3 × b × 45

b = 900 / [3 ×45] = 300/45

= 60/9 = 6.6

**b = 6.6 cm**

3. Volume =* l *× b × h

4200 =70 × 20 × h

h = 4200/ [70 × 20] = 42 / 14

**h = 3cm**

4**. **Volume =* l *× b × h

32000 = 80 × b × 20

b = 32000/ [80 × 20] = 320 / 16 = 36/12

**b = 20cm**

5**. **Volume =* l *× b × h

36 = 1 × 4 × 3

l = 36/ [4 ×3] = 36/12

**l= 3 cm**

** **

**3. Find the number of bricks of
dimension 20 cm × 5 cm × 10cm required to construct a wall of dimension 300 cm
× 200 cm × 20 cm.**

**Step: 1**

Length of brick = 20cm

Breadth of brick = 5cm

Height of brick = 10cm

Volume of brick =* l *× b
× h

= 20 × 5 ×10

Volumr of one brick = 1000 cu.cm

**Step: 2**

Length of wall = 300cm

Breadth of wall = 200cm

Height of wall = 20cm

Volume of wall =* l *× b
× h

= 300 × 200 × 20

= 1200000 cu.cm

Volume of wall = 12,00,000 cu.cm

Volume of one brick = 1000 cu.cm

No of brick required to construct a wall = 12,00,000 + 1000 =
1200

**Answer: 1200 bricks**

** **

**4. How many sack of dimension 15 cm × 45
cm × 90 cm filled with rice can be kept in a room of dimension 3 m × 18 m × 9
m.**

**Step: 1**

Length of 1 sack = 15cm

Breadth of 1 sack = 45cm

Height of 1 sack = 90cm

Volume of 1 sack =* l *×
b × h

= 15 × 45 × 90

Volume of one 1 sack = 60,750 cu.cm

**Step: 2**

Length of a room = 3m = 300cm

Breadth of a room = 18m = 1800cm

Height of a room = 9m = 900cm

Volume of a room =* l *×
b × h

= 300 × 1800 × 900

= 486000000 cu.cm

Volume of room = 48,60,00,000 cu.cm

Volume of one sack = 60,750 cu.cm

No of sack = 486000000 ÷ 60750

= 8000

**Answer: Total number of
sack = 8000**

__Answer:__

__Exercise 3.2 __

**1. (i) 90 cu.cm (ii) 3600 cu.cm (iii) 3, 75, 000 cu.cm (iv) 1000cu.cm (v) 1 cu.cm. **

**2. (i) 480 cu.cm (ii) 4cm (iii) 3cm (iv) 20 cm
(vi) 3m **

**3. 1200 bricks **

**4. 8000 sacks **

Tags : Measurements | Term 3 Chapter 3 | 5th Maths , 5th Maths : Term 3 Unit 3 : Measurements

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5th Maths : Term 3 Unit 3 : Measurements : Exercise 3.2 (Finding volume using water, unit cubes) | Measurements | Term 3 Chapter 3 | 5th Maths

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