Subtract 20/84 from 21/10
1st number: 2 1/10, 2nd number: 20/84
21/10 - 20/84 is 391/210.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 10 and 84 is 420
Next, find the equivalent fraction of both fractional numbers with denominator 420 - For the 1st fraction, since 10 × 42 = 420,
21/10 = 21 × 42/10 × 42 = 882/420 - Likewise, for the 2nd fraction, since 84 × 5 = 420,
20/84 = 20 × 5/84 × 5 = 100/420 - Subtract the two like fractions:
882/420 - 100/420 = 882 - 100/420 = 782/420 - After reducing the fraction, the answer is 391/210
- In mixed form: 1181/210
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 42/10-20/84 21/10-40/84 21/20-20/84 63/10-20/84 21/10-60/84 21/30-20/84 21/50-20/84 21/70-20/84