Subtract 80/7 from 40/18, Solve 2 4/18

Subtract 80/7 from 40/18

1^st number: 2 4/18, 2^nd number: 11 3/7

40/18 - 80/7 is -580/63.

Find the least common denominator or LCM of the two denominators:
LCM of 18 and 7 is 126

Next, find the equivalent fraction of both fractional numbers with denominator 126
For the 1st fraction, since 18 × 7 = 126,
40/18 = 40 × 7/18 × 7 = 280/126
Likewise, for the 2nd fraction, since 7 × 18 = 126,
80/7 = 80 × 18/7 × 18 = 1440/126
Subtract the two like fractions:
280/126 - 1440/126 = 280 - 1440/126 = -1160/126
After reducing the fraction, the answer is -580/63

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