Subtract 3/5 from 30/21
1st number: 1 9/21, 2nd number: 3/5
30/21 - 3/5 is 29/35.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 21 and 5 is 105
Next, find the equivalent fraction of both fractional numbers with denominator 105 - For the 1st fraction, since 21 × 5 = 105,
30/21 = 30 × 5/21 × 5 = 150/105 - Likewise, for the 2nd fraction, since 5 × 21 = 105,
3/5 = 3 × 21/5 × 21 = 63/105 - Subtract the two like fractions:
150/105 - 63/105 = 150 - 63/105 = 87/105 - After reducing the fraction, the answer is 29/35
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 60/21-3/5 30/21-6/5 30/42-3/5 30/21-3/10 90/21-3/5 30/21-9/5 30/63-3/5 30/21-3/15 30/21-15/5 30/21-3/25 30/21-21/5 30/21-3/35