Subtract 10/84 from 21/90
21/90 - 10/84 is 4/35.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 90 and 84 is 1260
Next, find the equivalent fraction of both fractional numbers with denominator 1260 - For the 1st fraction, since 90 × 14 = 1260,
21/90 = 21 × 14/90 × 14 = 294/1260 - Likewise, for the 2nd fraction, since 84 × 15 = 1260,
10/84 = 10 × 15/84 × 15 = 150/1260 - Subtract the two like fractions:
294/1260 - 150/1260 = 294 - 150/1260 = 144/1260 - After reducing the fraction, the answer is 4/35
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 42/90-10/84 21/90-20/84 63/90-10/84 21/90-30/84 21/90-50/84 21/90-70/84