Q : 3    Express as cm using decimals.

        (a) 5 mm     (b) 60 mm     (c) 164 mm     (d) 9 cm 8 mm     (e) 93 mm 

Answers (1)

As we know, 

1 cm = 10 mm 

which means 

1\:mm=\frac{1}{10}\:cm

So,

(a) 5 mm :

       5\:mm=5\times\frac{1}{10}=\frac{5}{10}=0.5\:cm    

(b) 60 mm

     60\:mm=60\times\frac{1}{10}=\frac{60}{10}=6.0\:cm    

(c) 164 mm

      164\:mm=164\times\frac{1}{10}=\frac{164}{10}=16.4\:cm

(d) 9 cm 8 mm

     9\:cm+8\:mm=9+8\times\frac{1}{10}=9+\frac{8}{10}=9+0.8=9.8\:cm    

(e) 93 mm 

     93\:mm=93\times\frac{1}{10}=\frac{93}{10}=9.3\:cm

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