Add 9/21 and 12/5
1st number: 9/21, 2nd number: 2 2/5
9/21 + 12/5 is 99/35.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 21 and 5 is 105
Next, find the equivalent fraction of both fractional numbers with denominator 105 - For the 1st fraction, since 21 × 5 = 105,
9/21 = 9 × 5/21 × 5 = 45/105 - Likewise, for the 2nd fraction, since 5 × 21 = 105,
12/5 = 12 × 21/5 × 21 = 252/105 - Add the two like fractions:
45/105 + 252/105 = 45 + 252/105 = 297/105 - 297/105 simplified gives 99/35
- So, 9/21 + 12/5 = 99/35
In mixed form: 229/35
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 18/21+12/5 9/21+24/5 9/42+12/5 9/21+12/10 27/21+12/5 9/21+36/5 9/63+12/5 9/21+12/15 45/21+12/5 9/21+60/5 9/21+12/25 63/21+12/5 9/21+84/5 9/21+12/35