Subtract 14/30 from 21/84
21/84 - 14/30 is -13/60.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 84 and 30 is 420
Next, find the equivalent fraction of both fractional numbers with denominator 420 - For the 1st fraction, since 84 × 5 = 420,
21/84 = 21 × 5/84 × 5 = 105/420 - Likewise, for the 2nd fraction, since 30 × 14 = 420,
14/30 = 14 × 14/30 × 14 = 196/420 - Subtract the two like fractions:
105/420 - 196/420 = 105 - 196/420 = -91/420 - After reducing the fraction, the answer is -13/60
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 42/84-14/30 21/84-28/30 21/84-14/60 63/84-14/30 21/84-42/30 21/84-14/90 21/84-70/30 21/84-98/30