Subtract 21/84 from 15/10
1st number: 1 5/10, 2nd number: 21/84
15/10 - 21/84 is 5/4.
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,
15/10 = 15 × 42/10 × 42 = 630/420 - Likewise, for the 2nd fraction, since 84 × 5 = 420,
21/84 = 21 × 5/84 × 5 = 105/420 - Subtract the two like fractions:
630/420 - 105/420 = 630 - 105/420 = 525/420 - After reducing the fraction, the answer is 5/4
- In mixed form: 11/4
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 30/10-21/84 15/10-42/84 15/20-21/84 45/10-21/84 15/10-63/84 15/30-21/84 75/10-21/84 15/50-21/84 15/70-21/84