Answers

Subtract 14/21 from 12/20

12/20 - 14/21 is -1/15.

Steps for subtracting fractions

1. Find the least common denominator or LCM of the two denominators:
   LCM of 20 and 21 is 420
   
   Next, find the equivalent fraction of both fractional numbers with denominator 420
2. For the 1st fraction, since 20 × 21 = 420,
   12/20 = 12 × 21/20 × 21 = 252/420
3. Likewise, for the 2nd fraction, since 21 × 20 = 420,
   14/21 = 14 × 20/21 × 20 = 280/420
4. Subtract the two like fractions:
   252/420 - 280/420 = 252 - 280/420 = -28/420
5. After reducing the fraction, the answer is -1/15

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