Subtract 90/27 from 12/45, Solve 12/45

Subtract 90/27 from 12/45

1^st number: 12/45, 2^nd number: 3 9/27

12/45 - 90/27 is -46/15.

Find the least common denominator or LCM of the two denominators:
LCM of 45 and 27 is 135

Next, find the equivalent fraction of both fractional numbers with denominator 135
For the 1st fraction, since 45 × 3 = 135,
12/45 = 12 × 3/45 × 3 = 36/135
Likewise, for the 2nd fraction, since 27 × 5 = 135,
90/27 = 90 × 5/27 × 5 = 450/135
Subtract the two like fractions:
36/135 - 450/135 = 36 - 450/135 = -414/135
After reducing the fraction, the answer is -46/15

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