Add 9/5 and 20/21
1st number: 1 4/5, 2nd number: 20/21
9/5 + 20/21 is 289/105.
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,
9/5 = 9 × 21/5 × 21 = 189/105 - Likewise, for the 2nd fraction, since 21 × 5 = 105,
20/21 = 20 × 5/21 × 5 = 100/105 - Add the two like fractions:
189/105 + 100/105 = 189 + 100/105 = 289/105 - So, 9/5 + 20/21 = 289/105
In mixed form: 279/105
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 18/5+20/21 9/5+40/21 9/10+20/21 9/5+20/42 27/5+20/21 9/5+60/21 9/15+20/21 9/5+20/63 45/5+20/21 9/25+20/21 63/5+20/21 9/35+20/21