Subtract 4/21 from 30/20
1st number: 1 10/20, 2nd number: 4/21
30/20 - 4/21 is 55/42.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 20 and 21 is 420
Next, find the equivalent fraction of both fractional numbers with denominator 420 - For the 1st fraction, since 20 × 21 = 420,
30/20 = 30 × 21/20 × 21 = 630/420 - Likewise, for the 2nd fraction, since 21 × 20 = 420,
4/21 = 4 × 20/21 × 20 = 80/420 - Subtract the two like fractions:
630/420 - 80/420 = 630 - 80/420 = 550/420 - After reducing the fraction, the answer is 55/42
- In mixed form: 113/42
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 60/20-4/21 30/20-8/21 30/40-4/21 30/20-4/42 90/20-4/21 30/20-12/21 30/60-4/21 30/20-4/63 30/20-20/21 30/20-28/21