Subtract 28/16 from 7/20
1st number: 7/20, 2nd number: 1 12/16
7/20 - 28/16 is -7/5.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 20 and 16 is 80
Next, find the equivalent fraction of both fractional numbers with denominator 80 - For the 1st fraction, since 20 × 4 = 80,
7/20 = 7 × 4/20 × 4 = 28/80 - Likewise, for the 2nd fraction, since 16 × 5 = 80,
28/16 = 28 × 5/16 × 5 = 140/80 - Subtract the two like fractions:
28/80 - 140/80 = 28 - 140/80 = -112/80 - After reducing the fraction, the answer is -7/5
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 14/20-28/16 7/20-56/16 7/40-28/16 7/20-28/32 21/20-28/16 7/20-84/16 7/60-28/16 7/20-28/48 35/20-28/16 7/20-28/80 49/20-28/16