Subtract 18/40 from 35/42
35/42 - 18/40 is 23/60.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 42 and 40 is 840
Next, find the equivalent fraction of both fractional numbers with denominator 840 - For the 1st fraction, since 42 × 20 = 840,
35/42 = 35 × 20/42 × 20 = 700/840 - Likewise, for the 2nd fraction, since 40 × 21 = 840,
18/40 = 18 × 21/40 × 21 = 378/840 - Subtract the two like fractions:
700/840 - 378/840 = 700 - 378/840 = 322/840 - After reducing the fraction, the answer is 23/60
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 70/42-18/40 35/42-36/40 35/84-18/40 35/42-18/80 35/42-54/40 35/42-90/40