Subtract 40/42 from 5/35
5/35 - 40/42 is -17/21.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 35 and 42 is 210
Next, find the equivalent fraction of both fractional numbers with denominator 210 - For the 1st fraction, since 35 × 6 = 210,
5/35 = 5 × 6/35 × 6 = 30/210 - Likewise, for the 2nd fraction, since 42 × 5 = 210,
40/42 = 40 × 5/42 × 5 = 200/210 - Subtract the two like fractions:
30/210 - 200/210 = 30 - 200/210 = -170/210 - After reducing the fraction, the answer is -17/21
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 10/35-40/42 5/35-80/42 5/70-40/42 5/35-40/84 15/35-40/42 25/35-40/42