Subtract 54/10 from 36/21, Solve 1 15/21

Subtract 54/10 from 36/21

1^st number: 1 15/21, 2^nd number: 5 4/10

36/21 - 54/10 is -129/35.

Find the least common denominator or LCM of the two denominators:
LCM of 21 and 10 is 210

Next, find the equivalent fraction of both fractional numbers with denominator 210
For the 1st fraction, since 21 × 10 = 210,
36/21 = 36 × 10/21 × 10 = 360/210
Likewise, for the 2nd fraction, since 10 × 21 = 210,
54/10 = 54 × 21/10 × 21 = 1134/210
Subtract the two like fractions:
360/210 - 1134/210 = 360 - 1134/210 = -774/210
After reducing the fraction, the answer is -129/35

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