Subtract 64/45 from 21/12
1st number: 1 9/12, 2nd number: 1 19/45
21/12 - 64/45 is 59/180.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 12 and 45 is 180
Next, find the equivalent fraction of both fractional numbers with denominator 180 - For the 1st fraction, since 12 × 15 = 180,
21/12 = 21 × 15/12 × 15 = 315/180 - Likewise, for the 2nd fraction, since 45 × 4 = 180,
64/45 = 64 × 4/45 × 4 = 256/180 - Subtract the two like fractions:
315/180 - 256/180 = 315 - 256/180 = 59/180
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 42/12-64/45 21/24-64/45 21/12-64/90 63/12-64/45 21/36-64/45 21/60-64/45 21/84-64/45