Add 9/21 and 15/80
9/21 + 15/80 is 69/112.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 21 and 80 is 1680
Next, find the equivalent fraction of both fractional numbers with denominator 1680 - For the 1st fraction, since 21 × 80 = 1680,
9/21 = 9 × 80/21 × 80 = 720/1680 - Likewise, for the 2nd fraction, since 80 × 21 = 1680,
15/80 = 15 × 21/80 × 21 = 315/1680 - Add the two like fractions:
720/1680 + 315/1680 = 720 + 315/1680 = 1035/1680 - 1035/1680 simplified gives 69/112
- So, 9/21 + 15/80 = 69/112
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 18/21+15/80 9/21+30/80 9/42+15/80 27/21+15/80 9/21+45/80 9/63+15/80 45/21+15/80 9/21+75/80 63/21+15/80