Subtract 21/35 from 10/30
10/30 - 21/35 is -4/15.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 30 and 35 is 210
Next, find the equivalent fraction of both fractional numbers with denominator 210 - For the 1st fraction, since 30 × 7 = 210,
10/30 = 10 × 7/30 × 7 = 70/210 - Likewise, for the 2nd fraction, since 35 × 6 = 210,
21/35 = 21 × 6/35 × 6 = 126/210 - Subtract the two like fractions:
70/210 - 126/210 = 70 - 126/210 = -56/210 - After reducing the fraction, the answer is -4/15
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 20/30-21/35 10/30-42/35 10/60-21/35 10/30-21/70 10/30-63/35 10/90-21/35 50/30-21/35 70/30-21/35