Subtract 2/21 from 21/30
21/30 - 2/21 is 127/210.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 30 and 21 is 210
Next, find the equivalent fraction of both fractional numbers with denominator 210 - For the 1st fraction, since 30 × 7 = 210,
21/30 = 21 × 7/30 × 7 = 147/210 - Likewise, for the 2nd fraction, since 21 × 10 = 210,
2/21 = 2 × 10/21 × 10 = 20/210 - Subtract the two like fractions:
147/210 - 20/210 = 147 - 20/210 = 127/210
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 42/30-2/21 21/30-4/21 21/60-2/21 21/30-2/42 63/30-2/21 21/30-6/21 21/90-2/21 21/30-2/63 21/30-10/21 21/30-14/21