Subtract 50/21 from 15/20
1st number: 15/20, 2nd number: 2 8/21
15/20 - 50/21 is -137/84.
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,
15/20 = 15 × 21/20 × 21 = 315/420 - Likewise, for the 2nd fraction, since 21 × 20 = 420,
50/21 = 50 × 20/21 × 20 = 1000/420 - Subtract the two like fractions:
315/420 - 1000/420 = 315 - 1000/420 = -685/420 - After reducing the fraction, the answer is -137/84
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 30/20-50/21 15/40-50/21 15/20-50/42 45/20-50/21 15/60-50/21 15/20-50/63 75/20-50/21