Add 63/35 and 42/21
1st number: 1 28/35, 2nd number: 2 0/21
63/35 + 42/21 is 19/5.
Steps for adding 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,
63/35 = 63 × 3/35 × 3 = 189/105 - Likewise, for the 2nd fraction, since 21 × 5 = 105,
42/21 = 42 × 5/21 × 5 = 210/105 - Add the two like fractions:
189/105 + 210/105 = 189 + 210/105 = 399/105 - 399/105 simplified gives 19/5
- So, 63/35 + 42/21 = 19/5
In mixed form: 34/5
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 63/35+84/21 63/70+42/21 63/35+42/63