Subtract 80/7 from 42/30
1st number: 1 12/30, 2nd number: 11 3/7
42/30 - 80/7 is -351/35.
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,
80/7 = 80 × 30/7 × 30 = 2400/210 - Subtract the two like fractions:
294/210 - 2400/210 = 294 - 2400/210 = -2106/210 - After reducing the fraction, the answer is -351/35
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 84/30-80/7 42/60-80/7 42/30-80/14 42/90-80/7 42/30-80/21 42/30-80/35 42/30-80/49