Subtract 20/35 from 3/18
3/18 - 20/35 is -17/42.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 18 and 35 is 630
Next, find the equivalent fraction of both fractional numbers with denominator 630 - For the 1st fraction, since 18 × 35 = 630,
3/18 = 3 × 35/18 × 35 = 105/630 - Likewise, for the 2nd fraction, since 35 × 18 = 630,
20/35 = 20 × 18/35 × 18 = 360/630 - Subtract the two like fractions:
105/630 - 360/630 = 105 - 360/630 = -255/630 - After reducing the fraction, the answer is -17/42
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 6/18-20/35 3/18-40/35 3/36-20/35 3/18-20/70 9/18-20/35 3/18-60/35 3/54-20/35 15/18-20/35 3/90-20/35 21/18-20/35