Subtract 28/35 from 42/21
1st number: 2 0/21, 2nd number: 28/35
42/21 - 28/35 is 6/5.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 21 and 35 is 105
Next, find the equivalent fraction of both fractional numbers with denominator 105 - For the 1st fraction, since 21 × 5 = 105,
42/21 = 42 × 5/21 × 5 = 210/105 - Likewise, for the 2nd fraction, since 35 × 3 = 105,
28/35 = 28 × 3/35 × 3 = 84/105 - Subtract the two like fractions:
210/105 - 84/105 = 210 - 84/105 = 126/105 - After reducing the fraction, the answer is 6/5
- In mixed form: 11/5
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 84/21-28/35 42/21-56/35 42/21-28/70 42/21-84/35 42/63-28/35