Subtract 80/49 from 40/54, Solve 40/54

Subtract 80/49 from 40/54

1^st number: 40/54, 2^nd number: 1 31/49

40/54 - 80/49 is -1180/1323.

Find the least common denominator or LCM of the two denominators:
LCM of 54 and 49 is 2646

Next, find the equivalent fraction of both fractional numbers with denominator 2646
For the 1st fraction, since 54 × 49 = 2646,
40/54 = 40 × 49/54 × 49 = 1960/2646
Likewise, for the 2nd fraction, since 49 × 54 = 2646,
80/49 = 80 × 54/49 × 54 = 4320/2646
Subtract the two like fractions:
1960/2646 - 4320/2646 = 1960 - 4320/2646 = -2360/2646
After reducing the fraction, the answer is -1180/1323

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