Subtract 28/70 from 4/20
4/20 - 28/70 is -1/5.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 20 and 70 is 140
Next, find the equivalent fraction of both fractional numbers with denominator 140 - For the 1st fraction, since 20 × 7 = 140,
4/20 = 4 × 7/20 × 7 = 28/140 - Likewise, for the 2nd fraction, since 70 × 2 = 140,
28/70 = 28 × 2/70 × 2 = 56/140 - Subtract the two like fractions:
28/140 - 56/140 = 28 - 56/140 = -28/140 - After reducing the fraction, the answer is -1/5
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 8/20-28/70 4/20-56/70 4/40-28/70 12/20-28/70 4/20-84/70 4/60-28/70 28/20-28/70