Subtract 90/20 from 10/84
1st number: 10/84, 2nd number: 4 10/20
10/84 - 90/20 is -92/21.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 84 and 20 is 420
Next, find the equivalent fraction of both fractional numbers with denominator 420 - For the 1st fraction, since 84 × 5 = 420,
10/84 = 10 × 5/84 × 5 = 50/420 - Likewise, for the 2nd fraction, since 20 × 21 = 420,
90/20 = 90 × 21/20 × 21 = 1890/420 - Subtract the two like fractions:
50/420 - 1890/420 = 50 - 1890/420 = -1840/420 - After reducing the fraction, the answer is -92/21
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 20/84-90/20 10/84-90/40 30/84-90/20 10/84-90/60 50/84-90/20 70/84-90/20