Subtract 10/42 from 81/70
1st number: 1 11/70, 2nd number: 10/42
81/70 - 10/42 is 193/210.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 70 and 42 is 210
Next, find the equivalent fraction of both fractional numbers with denominator 210 - For the 1st fraction, since 70 × 3 = 210,
81/70 = 81 × 3/70 × 3 = 243/210 - Likewise, for the 2nd fraction, since 42 × 5 = 210,
10/42 = 10 × 5/42 × 5 = 50/210 - Subtract the two like fractions:
243/210 - 50/210 = 243 - 50/210 = 193/210
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 81/70-20/42 81/70-10/84 81/70-30/42 81/70-50/42 81/70-70/42