Subtract 4/30 from 30/70
30/70 - 4/30 is 31/105.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 70 and 30 is 210
Next, find the equivalent fraction of both fractional numbers with denominator 210 - For the 1st fraction, since 70 × 3 = 210,
30/70 = 30 × 3/70 × 3 = 90/210 - Likewise, for the 2nd fraction, since 30 × 7 = 210,
4/30 = 4 × 7/30 × 7 = 28/210 - Subtract the two like fractions:
90/210 - 28/210 = 90 - 28/210 = 62/210 - After reducing the fraction, the answer is 31/105
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 60/70-4/30 30/70-8/30 30/70-4/60 90/70-4/30 30/70-12/30 30/70-4/90 30/70-20/30 30/70-28/30