Subtract 7/20 from 3/16
3/16 - 7/20 is -13/80.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 16 and 20 is 80
Next, find the equivalent fraction of both fractional numbers with denominator 80 - For the 1st fraction, since 16 × 5 = 80,
3/16 = 3 × 5/16 × 5 = 15/80 - Likewise, for the 2nd fraction, since 20 × 4 = 80,
7/20 = 7 × 4/20 × 4 = 28/80 - Subtract the two like fractions:
15/80 - 28/80 = 15 - 28/80 = -13/80
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 6/16-7/20 3/16-14/20 3/32-7/20 3/16-7/40 9/16-7/20 3/16-21/20 3/48-7/20 3/16-7/60 15/16-7/20 3/16-35/20 3/80-7/20 21/16-7/20 3/16-49/20