Question

Express the following in cm using decimals. 

(i) 5 mm 

(ii) 9 mm 

(iii) 42 mm 

(iv) 8 cm 9 mm 

(v) 375 mm

Answer 1

(i) 5 mm 

1 mm = \(\frac{1}{10}\) cm 

= 0.1 cm 

5 mm = \(\frac{5}{10}\)

= 0.5 cm 

(ii) 9 mm 

1 mm = \(\frac{1}{10}\) cm 

= 0.1 cm 

9 mm = \(\frac{9}{10}\) cm 

= 0.9 cm 

(iii) 42 mm 

1 mm = \(\frac{1}{10}\) cm 

= 0.1 cm 

42 mm = \(\frac{42}{10}\) cm 

= 4.2 cm 

(iv) 8 cm 9 mm 

1 mm = \(\frac{1}{10}\) cm 

= 0.1 cm 

8 cm 9 mm = 8 cm + \(\frac{9}{10}\) cm 

= 8.9 cm 

(v) 375 mm

1 mm = \(\frac{1}{10}\) cm 

= 0.1 cm 

375 mm = \(\frac{375}{10}\) cm 

= 37.5 cm