Subtract 42/27 from 9/80, Solve 9/80

Subtract 42/27 from 9/80

1^st number: 9/80, 2^nd number: 1 15/27

9/80 - 42/27 is -1039/720.

Find the least common denominator or LCM of the two denominators:
LCM of 80 and 27 is 2160

Next, find the equivalent fraction of both fractional numbers with denominator 2160
For the 1st fraction, since 80 × 27 = 2160,
9/80 = 9 × 27/80 × 27 = 243/2160
Likewise, for the 2nd fraction, since 27 × 80 = 2160,
42/27 = 42 × 80/27 × 80 = 3360/2160
Subtract the two like fractions:
243/2160 - 3360/2160 = 243 - 3360/2160 = -3117/2160
After reducing the fraction, the answer is -1039/720

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