Add 20/28 and 81/7
1st number: 20/28, 2nd number: 11 4/7
20/28 + 81/7 is 86/7.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 28 and 7 is 28
Next, find the equivalent fraction of both fractional numbers with denominator 28 - For the 1st fraction, since 28 × 1 = 28,
20/28 = 20 × 1/28 × 1 = 20/28 - Likewise, for the 2nd fraction, since 7 × 4 = 28,
81/7 = 81 × 4/7 × 4 = 324/28 - Add the two like fractions:
20/28 + 324/28 = 20 + 324/28 = 344/28 - 344/28 simplified gives 86/7
- So, 20/28 + 81/7 = 86/7
In mixed form: 122/7
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 40/28+81/7 20/56+81/7 20/28+81/14 60/28+81/7 20/84+81/7 20/28+81/21 20/28+81/35 20/28+81/49