Subtract 42/27 from 12/8, Solve 1 4/8

Subtract 42/27 from 12/8

1^st number: 1 4/8, 2^nd number: 1 15/27

12/8 - 42/27 is -1/18.

Find the least common denominator or LCM of the two denominators:
LCM of 8 and 27 is 216

Next, find the equivalent fraction of both fractional numbers with denominator 216
For the 1st fraction, since 8 × 27 = 216,
12/8 = 12 × 27/8 × 27 = 324/216
Likewise, for the 2nd fraction, since 27 × 8 = 216,
42/27 = 42 × 8/27 × 8 = 336/216
Subtract the two like fractions:
324/216 - 336/216 = 324 - 336/216 = -12/216
After reducing the fraction, the answer is -1/18

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