Subtract 30/42 from 81/10
1st number: 8 1/10, 2nd number: 30/42
81/10 - 30/42 is 517/70.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 10 and 42 is 210
Next, find the equivalent fraction of both fractional numbers with denominator 210 - For the 1st fraction, since 10 × 21 = 210,
81/10 = 81 × 21/10 × 21 = 1701/210 - Likewise, for the 2nd fraction, since 42 × 5 = 210,
30/42 = 30 × 5/42 × 5 = 150/210 - Subtract the two like fractions:
1701/210 - 150/210 = 1701 - 150/210 = 1551/210 - After reducing the fraction, the answer is 517/70
- In mixed form: 727/70
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 81/10-60/42 81/20-30/42 81/10-30/84 81/10-90/42 81/30-30/42 81/50-30/42 81/70-30/42