5. Without actual division, find which of the following rational numbers have terminating decimal expansion.
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Given 21/15
= ( 3 × 7 )/( 3 × 5 )
= 7/5
= 7/( 2^0 × 5¹ )
Is a terminating decimal .
Since , as the denominator is in the
form of 2ⁿ × 5^m .
21/15 = 7/5 = ( 7 × 2 )/( 5 × 2 )
= 14/10
= 1.4 ( terminating decimal )
••••
= ( 3 × 7 )/( 3 × 5 )
= 7/5
= 7/( 2^0 × 5¹ )
Is a terminating decimal .
Since , as the denominator is in the
form of 2ⁿ × 5^m .
21/15 = 7/5 = ( 7 × 2 )/( 5 × 2 )
= 14/10
= 1.4 ( terminating decimal )
••••
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