Subtract 90/28 from 21/45
1st number: 21/45, 2nd number: 3 6/28
21/45 - 90/28 is -577/210.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 45 and 28 is 1260
Next, find the equivalent fraction of both fractional numbers with denominator 1260 - For the 1st fraction, since 45 × 28 = 1260,
21/45 = 21 × 28/45 × 28 = 588/1260 - Likewise, for the 2nd fraction, since 28 × 45 = 1260,
90/28 = 90 × 45/28 × 45 = 4050/1260 - Subtract the two like fractions:
588/1260 - 4050/1260 = 588 - 4050/1260 = -3462/1260 - After reducing the fraction, the answer is -577/210
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 42/45-90/28 21/90-90/28 21/45-90/56 63/45-90/28 21/45-90/84