Add 18/28 and 30/80
18/28 + 30/80 is 57/56.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 28 and 80 is 560
Next, find the equivalent fraction of both fractional numbers with denominator 560 - For the 1st fraction, since 28 × 20 = 560,
18/28 = 18 × 20/28 × 20 = 360/560 - Likewise, for the 2nd fraction, since 80 × 7 = 560,
30/80 = 30 × 7/80 × 7 = 210/560 - Add the two like fractions:
360/560 + 210/560 = 360 + 210/560 = 570/560 - 570/560 simplified gives 57/56
- So, 18/28 + 30/80 = 57/56
In mixed form: 11/56
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 36/28+30/80 18/28+60/80 18/56+30/80 54/28+30/80 18/28+90/80 18/84+30/80 90/28+30/80