Subtract 36/7 from 81/24, Solve 3 9/24

Subtract 36/7 from 81/24

1^st number: 3 9/24, 2^nd number: 5 1/7

81/24 - 36/7 is -99/56.

Find the least common denominator or LCM of the two denominators:
LCM of 24 and 7 is 168

Next, find the equivalent fraction of both fractional numbers with denominator 168
For the 1st fraction, since 24 × 7 = 168,
81/24 = 81 × 7/24 × 7 = 567/168
Likewise, for the 2nd fraction, since 7 × 24 = 168,
36/7 = 36 × 24/7 × 24 = 864/168
Subtract the two like fractions:
567/168 - 864/168 = 567 - 864/168 = -297/168
After reducing the fraction, the answer is -99/56

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