Subtract 50/21 from 10/20
1st number: 10/20, 2nd number: 2 8/21
10/20 - 50/21 is -79/42.
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,
10/20 = 10 × 21/20 × 21 = 210/420 - Likewise, for the 2nd fraction, since 21 × 20 = 420,
50/21 = 50 × 20/21 × 20 = 1000/420 - Subtract the two like fractions:
210/420 - 1000/420 = 210 - 1000/420 = -790/420 - After reducing the fraction, the answer is -79/42
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 10/40-50/21 10/20-50/42 30/20-50/21 10/60-50/21 10/20-50/63 50/20-50/21 70/20-50/21