Subtract 63/45 from 27/80, Solve 27/80

Subtract 63/45 from 27/80

1^st number: 27/80, 2^nd number: 1 18/45

27/80 - 63/45 is -17/16.

Find the least common denominator or LCM of the two denominators:
LCM of 80 and 45 is 720

Next, find the equivalent fraction of both fractional numbers with denominator 720
For the 1st fraction, since 80 × 9 = 720,
27/80 = 27 × 9/80 × 9 = 243/720
Likewise, for the 2nd fraction, since 45 × 16 = 720,
63/45 = 63 × 16/45 × 16 = 1008/720
Subtract the two like fractions:
243/720 - 1008/720 = 243 - 1008/720 = -765/720
After reducing the fraction, the answer is -17/16

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