Add 20/15 and 18/56
1st number: 1 5/15, 2nd number: 18/56
20/15 + 18/56 is 139/84.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 15 and 56 is 840
Next, find the equivalent fraction of both fractional numbers with denominator 840 - For the 1st fraction, since 15 × 56 = 840,
20/15 = 20 × 56/15 × 56 = 1120/840 - Likewise, for the 2nd fraction, since 56 × 15 = 840,
18/56 = 18 × 15/56 × 15 = 270/840 - Add the two like fractions:
1120/840 + 270/840 = 1120 + 270/840 = 1390/840 - 1390/840 simplified gives 139/84
- So, 20/15 + 18/56 = 139/84
In mixed form: 155/84
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 40/15+18/56 20/15+36/56 20/30+18/56 60/15+18/56 20/15+54/56 20/45+18/56 20/15+90/56 20/75+18/56