Subtract 49/16 from 42/20
1st number: 2 2/20, 2nd number: 3 1/16
42/20 - 49/16 is -77/80.
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,
42/20 = 42 × 4/20 × 4 = 168/80 - Likewise, for the 2nd fraction, since 16 × 5 = 80,
49/16 = 49 × 5/16 × 5 = 245/80 - Subtract the two like fractions:
168/80 - 245/80 = 168 - 245/80 = -77/80
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 84/20-49/16 42/20-98/16 42/40-49/16 42/20-49/32 42/60-49/16 42/20-49/48 42/20-49/80