Subtract 3/21 from 50/70
50/70 - 3/21 is 4/7.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 70 and 21 is 210
Next, find the equivalent fraction of both fractional numbers with denominator 210 - For the 1st fraction, since 70 × 3 = 210,
50/70 = 50 × 3/70 × 3 = 150/210 - Likewise, for the 2nd fraction, since 21 × 10 = 210,
3/21 = 3 × 10/21 × 10 = 30/210 - Subtract the two like fractions:
150/210 - 30/210 = 150 - 30/210 = 120/210 - After reducing the fraction, the answer is 4/7
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 50/70-6/21 50/70-3/42 50/70-9/21 50/70-3/63 50/70-15/21