Add 21/35 and 4/21
21/35 + 4/21 is 83/105.
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,
4/21 = 4 × 5/21 × 5 = 20/105 - Add the two like fractions:
63/105 + 20/105 = 63 + 20/105 = 83/105 - So, 21/35 + 4/21 = 83/105
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 42/35+4/21 21/35+8/21 21/70+4/21 21/35+4/42 63/35+4/21 21/35+12/21 21/35+4/63 21/35+20/21 21/35+28/21