Add 2/5 and 1/21
2/5 + 1/21 is 47/105.
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,
2/5 = 2 × 21/5 × 21 = 42/105 - Likewise, for the 2nd fraction, since 21 × 5 = 105,
1/21 = 1 × 5/21 × 5 = 5/105 - Add the two like fractions:
42/105 + 5/105 = 42 + 5/105 = 47/105 - So, 2/5 + 1/21 = 47/105
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 4/5+1/21 2/5+2/21 2/10+1/21 2/5+1/42 6/5+1/21 2/5+3/21 2/15+1/21 2/5+1/63 10/5+1/21 2/5+5/21 2/25+1/21 14/5+1/21 2/5+7/21 2/35+1/21