class 7 maths 2.5|| class 7th maths chapter 2 exercise 2.5||class 7 math ex 2.5

 

                                                     Class 7th     Chapter   2      Exercise  2.5     

      class 7 maths 2.5|| class 7th maths chapter 2 exercise 2.5||class 7 math ex 2.5  

Q3 1) Express 5 cm in m and km

sol 5 cm to m
This implies 100 cm = 1 m
1 cm = 1/100 m

5 cm = 1/100 ✕ 5

5 cm = 5/100 = 0.05 m

5 cm = 0.05 m Answer
Next Step , 5 cm = 5cm to kilometre

1000 m = 1 km

1 m = 1/1000 km

0.05 m = 1/1000 ✕ 0.05 km

= 0.05/1000

0.05 m = 0.00005 km

5 cm = 0.00005 km

class 7 maths 2.5|| class 7th maths chapter 2 exercise 2.5||class 7 math ex 2.5  

Q3 (2) Express 35 mm in cm, m, and km.
sol 35 mm to cm

10 mm = 1 cm

1mm = 1/10 cm

35 mm = 1/10 ✕ 35

35 mm = 35/10 cm

35 mm = 3.5 cm

Next Step, 35 mm to m

100 cm = 1 m

1 cm = 1/100 m

3.5 cm = 1/100 ✕ 3.5 m

3.5 cm = 3.5/100

3.5 cm = 0.035 m

3.5 mm = 0.035 m

Final Step, 35 mm to km

1000 m = 1 km

1 m = 1/1000 km

0.035 m = 1/1000 ✕ 0.035 km

0.35 m = 0.035/1000 km

0.035 m = 0.000035 km

0.035 m = 0.000035 km Answer

class 7 maths 2.5|| class 7th maths chapter 2 exercise 2.5||class 7 math ex 2.5  

Q4) Express in kg

(1) 200g

sol 1000 g = 1kg

1g = 1/1000 kg

200 g = 1/1000 ✕ 200kg

200g = 200/1000 kg = 2/10 kg

200g = 0.2 kg Answer

(2) 3470g

sol 1000g = 1 kg

1g = 1/1000 kg

3470g = 1/1000 ✕ 3470 kg

3470g = 3470/1000 kg

3470g = 3.470 kg Answer

(3) 4kg 8g

sol 1000g = 1kg

1g = 1/1000 kg

8g = 1/1000 ✕ 8 kg

8g = 8/1000 kg

8g = 0.008 kg

4 kg 8g = 4kg + 0.008kg

= 4.008 kg Ans

class 7 maths 2.5|| class 7th maths chapter 2 exercise 2.5||class 7 math ex 2.5