Subtract 21/7 from 20/16
1st number: 1 4/16, 2nd number: 3 0/7
20/16 - 21/7 is -7/4.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 16 and 7 is 112
Next, find the equivalent fraction of both fractional numbers with denominator 112 - For the 1st fraction, since 16 × 7 = 112,
20/16 = 20 × 7/16 × 7 = 140/112 - Likewise, for the 2nd fraction, since 7 × 16 = 112,
21/7 = 21 × 16/7 × 16 = 336/112 - Subtract the two like fractions:
140/112 - 336/112 = 140 - 336/112 = -196/112 - After reducing the fraction, the answer is -7/4
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 40/16-21/7 20/16-42/7 20/32-21/7 20/16-21/14 60/16-21/7 20/16-63/7 20/48-21/7 20/80-21/7 20/16-21/35 20/16-21/49