Subtract 21/12 from 16/45
1st number: 16/45, 2nd number: 1 9/12
16/45 - 21/12 is -251/180.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 45 and 12 is 180
Next, find the equivalent fraction of both fractional numbers with denominator 180 - For the 1st fraction, since 45 × 4 = 180,
16/45 = 16 × 4/45 × 4 = 64/180 - Likewise, for the 2nd fraction, since 12 × 15 = 180,
21/12 = 21 × 15/12 × 15 = 315/180 - Subtract the two like fractions:
64/180 - 315/180 = 64 - 315/180 = -251/180
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 32/45-21/12 16/45-42/12 16/90-21/12 16/45-21/24 48/45-21/12 16/45-63/12 16/45-21/36 80/45-21/12 16/45-21/60 16/45-21/84