Subtract 5/84 from 21/30
21/30 - 5/84 is 269/420.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 30 and 84 is 420
Next, find the equivalent fraction of both fractional numbers with denominator 420 - For the 1st fraction, since 30 × 14 = 420,
21/30 = 21 × 14/30 × 14 = 294/420 - Likewise, for the 2nd fraction, since 84 × 5 = 420,
5/84 = 5 × 5/84 × 5 = 25/420 - Subtract the two like fractions:
294/420 - 25/420 = 294 - 25/420 = 269/420
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 42/30-5/84 21/30-10/84 21/60-5/84 63/30-5/84 21/30-15/84 21/90-5/84 21/30-25/84 21/30-35/84