Subtract 25/10 from 36/21, Solve 1 15/21

Subtract 25/10 from 36/21

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

36/21 - 25/10 is -11/14.

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,
25/10 = 25 × 21/10 × 21 = 525/210
Subtract the two like fractions:
360/210 - 525/210 = 360 - 525/210 = -165/210
After reducing the fraction, the answer is -11/14

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