Subtract 18/70 from 4/42
4/42 - 18/70 is -17/105.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 42 and 70 is 210
Next, find the equivalent fraction of both fractional numbers with denominator 210 - For the 1st fraction, since 42 × 5 = 210,
4/42 = 4 × 5/42 × 5 = 20/210 - Likewise, for the 2nd fraction, since 70 × 3 = 210,
18/70 = 18 × 3/70 × 3 = 54/210 - Subtract the two like fractions:
20/210 - 54/210 = 20 - 54/210 = -34/210 - After reducing the fraction, the answer is -17/105
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 8/42-18/70 4/42-36/70 4/84-18/70 12/42-18/70 4/42-54/70 20/42-18/70 4/42-90/70 28/42-18/70