Subtract 40/21 from 21/35
1st number: 21/35, 2nd number: 1 19/21
21/35 - 40/21 is -137/105.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 35 and 21 is 105
Next, find the equivalent fraction of both fractional numbers with denominator 105 - For the 1st fraction, since 35 × 3 = 105,
21/35 = 21 × 3/35 × 3 = 63/105 - Likewise, for the 2nd fraction, since 21 × 5 = 105,
40/21 = 40 × 5/21 × 5 = 200/105 - Subtract the two like fractions:
63/105 - 200/105 = 63 - 200/105 = -137/105
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 42/35-40/21 21/35-80/21 21/70-40/21 21/35-40/42 63/35-40/21 21/35-40/63