Subtract 2/21 from 12/54
12/54 - 2/21 is 8/63.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 54 and 21 is 378
Next, find the equivalent fraction of both fractional numbers with denominator 378 - For the 1st fraction, since 54 × 7 = 378,
12/54 = 12 × 7/54 × 7 = 84/378 - Likewise, for the 2nd fraction, since 21 × 18 = 378,
2/21 = 2 × 18/21 × 18 = 36/378 - Subtract the two like fractions:
84/378 - 36/378 = 84 - 36/378 = 48/378 - After reducing the fraction, the answer is 8/63
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 24/54-2/21 12/54-4/21 12/54-2/42 36/54-2/21 12/54-6/21 12/54-2/63 60/54-2/21 12/54-10/21 84/54-2/21 12/54-14/21