# (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, numerators and denominators 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

∴1mm = 101 cm

35mm = 35 ×1/10 cm

35mm = 3.5 cm

Now, converting 3.5 cm in 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 = 1km

∴ 1m = 1000 km

0.035 m = 0.035×1/1000 km

0.035 m = 0.000035 km

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**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

(i) Express 5 cm in metre and kilometre (ii) Express 35 mm in cm, m and km

Conversion of cm to kilometer gives i) 0.00005 km, ii) 0.000035 km