Add 1/5 and 9/21
1/5 + 9/21 is 22/35.
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,
1/5 = 1 × 21/5 × 21 = 21/105 - Likewise, for the 2nd fraction, since 21 × 5 = 105,
9/21 = 9 × 5/21 × 5 = 45/105 - Add the two like fractions:
21/105 + 45/105 = 21 + 45/105 = 66/105 - 66/105 simplified gives 22/35
- So, 1/5 + 9/21 = 22/35
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 2/5+9/21 1/5+18/21 1/10+9/21 1/5+9/42 3/5+9/21 1/5+27/21 1/15+9/21 1/5+9/63 1/5+45/21 1/25+9/21 7/5+9/21 1/5+63/21 1/35+9/21