Subtract 21/45 from 90/84
1st number: 1 6/84, 2nd number: 21/45
90/84 - 21/45 is 127/210.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 84 and 45 is 1260
Next, find the equivalent fraction of both fractional numbers with denominator 1260 - For the 1st fraction, since 84 × 15 = 1260,
90/84 = 90 × 15/84 × 15 = 1350/1260 - Likewise, for the 2nd fraction, since 45 × 28 = 1260,
21/45 = 21 × 28/45 × 28 = 588/1260 - Subtract the two like fractions:
1350/1260 - 588/1260 = 1350 - 588/1260 = 762/1260 - After reducing the fraction, the answer is 127/210
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 90/84-42/45 90/84-21/90 90/84-63/45