Subtract 81/10 from 28/42
1st number: 28/42, 2nd number: 8 1/10
28/42 - 81/10 is -223/30.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 42 and 10 is 210
Next, find the equivalent fraction of both fractional numbers with denominator 210 - For the 1st fraction, since 42 × 5 = 210,
28/42 = 28 × 5/42 × 5 = 140/210 - Likewise, for the 2nd fraction, since 10 × 21 = 210,
81/10 = 81 × 21/10 × 21 = 1701/210 - Subtract the two like fractions:
140/210 - 1701/210 = 140 - 1701/210 = -1561/210 - After reducing the fraction, the answer is -223/30
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 56/42-81/10 28/84-81/10 28/42-81/20 84/42-81/10 28/42-81/30 28/42-81/50 28/42-81/70