Subtract 21/12 from 50/90
1st number: 50/90, 2nd number: 1 9/12
50/90 - 21/12 is -43/36.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 90 and 12 is 180
Next, find the equivalent fraction of both fractional numbers with denominator 180 - For the 1st fraction, since 90 × 2 = 180,
50/90 = 50 × 2/90 × 2 = 100/180 - Likewise, for the 2nd fraction, since 12 × 15 = 180,
21/12 = 21 × 15/12 × 15 = 315/180 - Subtract the two like fractions:
100/180 - 315/180 = 100 - 315/180 = -215/180 - After reducing the fraction, the answer is -43/36
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 50/90-42/12 50/90-21/24 50/90-63/12 50/90-21/36 50/90-21/60 50/90-21/84