Subtract 18/70 from 3/20
3/20 - 18/70 is -3/28.
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,
3/20 = 3 × 7/20 × 7 = 21/140 - Likewise, for the 2nd fraction, since 70 × 2 = 140,
18/70 = 18 × 2/70 × 2 = 36/140 - Subtract the two like fractions:
21/140 - 36/140 = 21 - 36/140 = -15/140 - After reducing the fraction, the answer is -3/28
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 6/20-18/70 3/20-36/70 3/40-18/70 9/20-18/70 3/20-54/70 3/60-18/70 15/20-18/70 3/20-90/70 21/20-18/70