Q : 2    Express as metres using decimals.

        (a) 15 cm         (b) 6 cm         (c) 2 m 45 cm         (d) 9 m 7 cm         (e) 419 cm 

Answers (1)

As we know 

1 m = 100 cm 

Which means 

1\:cm=\frac{1}{100}\:m.

So,

(a) 15 cm

       15\:cm=15\times\frac{1}{100}=\frac{15}{100}=0.15\:m        

(b) 6 cm         

        6\:cm=6\times\frac{1}{100}=\frac{6}{100}=0.06\:m

(c) 2 m 45 cm

          2+45\:cm=2+45\times\frac{1}{100}=2+\frac{45}{100}=2+0.45=2.45\:m        

(d) 9 m 7 cm

          9+7\:cm=9+7\times\frac{1}{100}=9+\frac{7}{100}=9+0.07=9.07\:m        

(e) 419 cm 

          419\:cm=419\times\frac{1}{100}=\frac{419}{100}=4.19\:m

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