Add 3/5 and 8/21
3/5 + 8/21 is 103/105.
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,
3/5 = 3 × 21/5 × 21 = 63/105 - Likewise, for the 2nd fraction, since 21 × 5 = 105,
8/21 = 8 × 5/21 × 5 = 40/105 - Add the two like fractions:
63/105 + 40/105 = 63 + 40/105 = 103/105 - So, 3/5 + 8/21 = 103/105
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 6/5+8/21 3/5+16/21 3/10+8/21 3/5+8/42 9/5+8/21 3/5+24/21 3/15+8/21 3/5+8/63 15/5+8/21 3/5+40/21 3/25+8/21 21/5+8/21 3/5+56/21 3/35+8/21