Subtract 21/10 from 28/4
1st number: 7 0/4, 2nd number: 2 1/10
28/4 - 21/10 is 49/10.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 4 and 10 is 20
Next, find the equivalent fraction of both fractional numbers with denominator 20 - For the 1st fraction, since 4 × 5 = 20,
28/4 = 28 × 5/4 × 5 = 140/20 - Likewise, for the 2nd fraction, since 10 × 2 = 20,
21/10 = 21 × 2/10 × 2 = 42/20 - Subtract the two like fractions:
140/20 - 42/20 = 140 - 42/20 = 98/20 - After reducing the fraction, the answer is 49/10
- In mixed form: 49/10
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 56/4-21/10 28/4-42/10 28/8-21/10 28/4-21/20 84/4-21/10 28/4-63/10 28/12-21/10 28/4-21/30 28/20-21/10 28/4-21/50 28/4-21/70