Add 30/21 and 15/80
1st number: 1 9/21, 2nd number: 15/80
30/21 + 15/80 is 181/112.
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,
30/21 = 30 × 80/21 × 80 = 2400/1680 - Likewise, for the 2nd fraction, since 80 × 21 = 1680,
15/80 = 15 × 21/80 × 21 = 315/1680 - Add the two like fractions:
2400/1680 + 315/1680 = 2400 + 315/1680 = 2715/1680 - 2715/1680 simplified gives 181/112
- So, 30/21 + 15/80 = 181/112
In mixed form: 169/112
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 60/21+15/80 30/21+30/80 30/42+15/80 90/21+15/80 30/21+45/80 30/63+15/80 30/21+75/80