Add 18/28 and 45/20
1st number: 18/28, 2nd number: 2 5/20
18/28 + 45/20 is 81/28.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 28 and 20 is 140
Next, find the equivalent fraction of both fractional numbers with denominator 140 - For the 1st fraction, since 28 × 5 = 140,
18/28 = 18 × 5/28 × 5 = 90/140 - Likewise, for the 2nd fraction, since 20 × 7 = 140,
45/20 = 45 × 7/20 × 7 = 315/140 - Add the two like fractions:
90/140 + 315/140 = 90 + 315/140 = 405/140 - 405/140 simplified gives 81/28
- So, 18/28 + 45/20 = 81/28
In mixed form: 225/28
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 36/28+45/20 18/28+90/20 18/56+45/20 18/28+45/40 54/28+45/20 18/84+45/20 18/28+45/60 90/28+45/20