Subtract 27/7 from 42/30
1st number: 1 12/30, 2nd number: 3 6/7
42/30 - 27/7 is -86/35.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 30 and 7 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 7 × 30 = 210,
27/7 = 27 × 30/7 × 30 = 810/210 - Subtract the two like fractions:
294/210 - 810/210 = 294 - 810/210 = -516/210 - After reducing the fraction, the answer is -86/35
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 84/30-27/7 42/30-54/7 42/60-27/7 42/30-27/14 42/30-81/7 42/90-27/7 42/30-27/21 42/30-27/35 42/30-27/49