Add 5/21 and 20/9
1st number: 5/21, 2nd number: 2 2/9
5/21 + 20/9 is 155/63.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 21 and 9 is 63
Next, find the equivalent fraction of both fractional numbers with denominator 63 - For the 1st fraction, since 21 × 3 = 63,
5/21 = 5 × 3/21 × 3 = 15/63 - Likewise, for the 2nd fraction, since 9 × 7 = 63,
20/9 = 20 × 7/9 × 7 = 140/63 - Add the two like fractions:
15/63 + 140/63 = 15 + 140/63 = 155/63 - So, 5/21 + 20/9 = 155/63
In mixed form: 229/63
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 10/21+20/9 5/21+40/9 5/42+20/9 5/21+20/18 15/21+20/9 5/21+60/9 5/63+20/9 5/21+20/27 25/21+20/9 5/21+20/45 35/21+20/9 5/21+20/63