Subtract 90/7 from 50/30
1st number: 1 20/30, 2nd number: 12 6/7
50/30 - 90/7 is -235/21.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 30 and 7 is 210
Next, find the equivalent fraction of both fractional numbers with denominator 210 - For the 1st fraction, since 30 × 7 = 210,
50/30 = 50 × 7/30 × 7 = 350/210 - Likewise, for the 2nd fraction, since 7 × 30 = 210,
90/7 = 90 × 30/7 × 30 = 2700/210 - Subtract the two like fractions:
350/210 - 2700/210 = 350 - 2700/210 = -2350/210 - After reducing the fraction, the answer is -235/21
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 50/60-90/7 50/30-90/14 50/90-90/7 50/30-90/21 50/30-90/35 50/30-90/49