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Question

Write down the decimal expansion of the following rational numbers by writing the denominators in the form 2m×5n, where m,n are non-negative integers.
(i) 38 (ii) 13125 (iii) 780 (iv) 14588625 (v) 12922×57

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Solution

(i) 38=(323)=0.375 ,

(ii) 13125=1353=0.104

(iii) 780=724×5=0.0875 ,
(iv) 14588625=1458854=23.34

(v) 12922×57=4.128×104

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