Add 21/35 and 36/21
1st number: 21/35, 2nd number: 1 15/21
21/35 + 36/21 is 81/35.
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,
21/35 = 21 × 3/35 × 3 = 63/105 - Likewise, for the 2nd fraction, since 21 × 5 = 105,
36/21 = 36 × 5/21 × 5 = 180/105 - Add the two like fractions:
63/105 + 180/105 = 63 + 180/105 = 243/105 - 243/105 simplified gives 81/35
- So, 21/35 + 36/21 = 81/35
In mixed form: 211/35
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 42/35+36/21 21/35+72/21 21/70+36/21 21/35+36/42 63/35+36/21 21/35+36/63