Subtract 84/30 from 21/10
1st number: 2 1/10, 2nd number: 2 24/30
21/10 - 84/30 is -7/10.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 10 and 30 is 30
Next, find the equivalent fraction of both fractional numbers with denominator 30 - For the 1st fraction, since 10 × 3 = 30,
21/10 = 21 × 3/10 × 3 = 63/30 - Likewise, for the 2nd fraction, since 30 × 1 = 30,
84/30 = 84 × 1/30 × 1 = 84/30 - Subtract the two like fractions:
63/30 - 84/30 = 63 - 84/30 = -21/30 - After reducing the fraction, the answer is -7/10
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 42/10-84/30 21/20-84/30 21/10-84/60 63/10-84/30 21/30-84/30 21/10-84/90 21/50-84/30 21/70-84/30