Add 18/7 and 45/20
1st number: 2 4/7, 2nd number: 2 5/20
18/7 + 45/20 is 135/28.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 7 and 20 is 140
Next, find the equivalent fraction of both fractional numbers with denominator 140 - For the 1st fraction, since 7 × 20 = 140,
18/7 = 18 × 20/7 × 20 = 360/140 - Likewise, for the 2nd fraction, since 20 × 7 = 140,
45/20 = 45 × 7/20 × 7 = 315/140 - Add the two like fractions:
360/140 + 315/140 = 360 + 315/140 = 675/140 - 675/140 simplified gives 135/28
- So, 18/7 + 45/20 = 135/28
In mixed form: 423/28
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 36/7+45/20 18/7+90/20 18/14+45/20 18/7+45/40 54/7+45/20 18/21+45/20 18/7+45/60 90/7+45/20 18/35+45/20 18/49+45/20