Add 9/21 and 20/15
1st number: 9/21, 2nd number: 1 5/15
9/21 + 20/15 is 37/21.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 21 and 15 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 15 × 7 = 105,
20/15 = 20 × 7/15 × 7 = 140/105 - Add the two like fractions:
45/105 + 140/105 = 45 + 140/105 = 185/105 - 185/105 simplified gives 37/21
- So, 9/21 + 20/15 = 37/21
In mixed form: 116/21
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 18/21+20/15 9/21+40/15 9/42+20/15 9/21+20/30 27/21+20/15 9/21+60/15 9/63+20/15 9/21+20/45 45/21+20/15 9/21+20/75 63/21+20/15