Subtract 25/60 from 12/21, Solve 12/21

Subtract 25/60 from 12/21

12/21 - 25/60 is 13/84.

Find the least common denominator or LCM of the two denominators:
LCM of 21 and 60 is 420

Next, find the equivalent fraction of both fractional numbers with denominator 420
For the 1st fraction, since 21 × 20 = 420,
12/21 = 12 × 20/21 × 20 = 240/420
Likewise, for the 2nd fraction, since 60 × 7 = 420,
25/60 = 25 × 7/60 × 7 = 175/420
Subtract the two like fractions:
240/420 - 175/420 = 240 - 175/420 = 65/420
After reducing the fraction, the answer is 13/84

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