Subtract 81/35 from 42/30
1st number: 1 12/30, 2nd number: 2 11/35
42/30 - 81/35 is -32/35.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 30 and 35 is 210
Next, find the equivalent fraction of both fractional numbers with denominator 210 - For the 1st fraction, since 30 × 7 = 210,
42/30 = 42 × 7/30 × 7 = 294/210 - Likewise, for the 2nd fraction, since 35 × 6 = 210,
81/35 = 81 × 6/35 × 6 = 486/210 - Subtract the two like fractions:
294/210 - 486/210 = 294 - 486/210 = -192/210 - After reducing the fraction, the answer is -32/35
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 84/30-81/35 42/60-81/35 42/30-81/70 42/90-81/35