(i) Express 5 cm in metre and kilometre
(ii) Express 35 mm in cm, m and km
Solution:
We use the basic concepts of fractions to answer the question given.
We solve the above question by representing the part as a fraction of the whole.
(i) 5 cm
∵100 cm = 1m
∴1 cm = 1/100 m
5 cm = 5 × 1/100 m
5 cm = 0.05 m
Also, 1000 m = 1 km
∴1 m = 1/1000 km
Thus,
0.05 m = 0.05 × 1/1000 km
= 0.00005 km
(ii) Express 35 mm in cm, m and km.
∵10 mm = 1 cm
∴1 mm = 1/10 cm
35 mm = 35 ×1/10 cm
35 mm = 3.5 cm
Now, converting 3.5 cm to m, we get
∵100 cm = 1 m
∴ 1 cm = 1/100 m
3.5 cm = 3.5 × 1/100
3.5 cm = 0.035 m
Again, converting 0.035 m into km
∵1000 m = 1 km
∴ 1 m = 1/1000 km
0.035 m = 0.035 × 1/1000 km
0.035 m = 0.000035 km
☛ Check: NCERT Solutions for Class 7 Maths Chapter 2
Video Solution:
(i) Express 5 cm in metre and kilometre (ii) Express 35 mm in cm, m and km
NCERT Solutions Class 7 Maths Chapter 2 Exercise 2.5 Question 3
Summary:
(i) 5 cm in metre and kilometre are expressed as 0.05 m and 0.00005 km respectively. (ii) 35 mm in cm, m and km are expressed as 3.5 cm, 0.035 m and 0.000035 km respectively.
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