Subtract 25/35 from 18/42
18/42 - 25/35 is -2/7.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 42 and 35 is 210
Next, find the equivalent fraction of both fractional numbers with denominator 210 - For the 1st fraction, since 42 × 5 = 210,
18/42 = 18 × 5/42 × 5 = 90/210 - Likewise, for the 2nd fraction, since 35 × 6 = 210,
25/35 = 25 × 6/35 × 6 = 150/210 - Subtract the two like fractions:
90/210 - 150/210 = 90 - 150/210 = -60/210 - After reducing the fraction, the answer is -2/7
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 36/42-25/35 18/42-50/35 18/84-25/35 18/42-25/70 54/42-25/35 18/42-75/35 90/42-25/35