Add 4/5 and 3/21
4/5 + 3/21 is 33/35.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 5 and 21 is 105
Next, find the equivalent fraction of both fractional numbers with denominator 105 - For the 1st fraction, since 5 × 21 = 105,
4/5 = 4 × 21/5 × 21 = 84/105 - Likewise, for the 2nd fraction, since 21 × 5 = 105,
3/21 = 3 × 5/21 × 5 = 15/105 - Add the two like fractions:
84/105 + 15/105 = 84 + 15/105 = 99/105 - 99/105 simplified gives 33/35
- So, 4/5 + 3/21 = 33/35
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 8/5+3/21 4/5+6/21 4/10+3/21 4/5+3/42 12/5+3/21 4/5+9/21 4/15+3/21 4/5+3/63 20/5+3/21 4/5+15/21 4/25+3/21 28/5+3/21 4/35+3/21