Subtract 90/21 from 36/56
1st number: 36/56, 2nd number: 4 6/21
36/56 - 90/21 is -51/14.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 56 and 21 is 168
Next, find the equivalent fraction of both fractional numbers with denominator 168 - For the 1st fraction, since 56 × 3 = 168,
36/56 = 36 × 3/56 × 3 = 108/168 - Likewise, for the 2nd fraction, since 21 × 8 = 168,
90/21 = 90 × 8/21 × 8 = 720/168 - Subtract the two like fractions:
108/168 - 720/168 = 108 - 720/168 = -612/168 - After reducing the fraction, the answer is -51/14
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 72/56-90/21 36/56-90/42 36/56-90/63