Subtract 84/16 from 21/20
1st number: 1 1/20, 2nd number: 5 4/16
21/20 - 84/16 is -21/5.
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,
21/20 = 21 × 4/20 × 4 = 84/80 - Likewise, for the 2nd fraction, since 16 × 5 = 80,
84/16 = 84 × 5/16 × 5 = 420/80 - Subtract the two like fractions:
84/80 - 420/80 = 84 - 420/80 = -336/80 - After reducing the fraction, the answer is -21/5
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 42/20-84/16 21/40-84/16 21/20-84/32 63/20-84/16 21/60-84/16 21/20-84/48 21/20-84/80