Add 20/72 and 45/18
1st number: 20/72, 2nd number: 2 9/18
20/72 + 45/18 is 25/9.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 72 and 18 is 72
Next, find the equivalent fraction of both fractional numbers with denominator 72 - For the 1st fraction, since 72 × 1 = 72,
20/72 = 20 × 1/72 × 1 = 20/72 - Likewise, for the 2nd fraction, since 18 × 4 = 72,
45/18 = 45 × 4/18 × 4 = 180/72 - Add the two like fractions:
20/72 + 180/72 = 20 + 180/72 = 200/72 - 200/72 simplified gives 25/9
- So, 20/72 + 45/18 = 25/9
In mixed form: 27/9
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 40/72+45/18 20/72+90/18 20/72+45/36 60/72+45/18 20/72+45/54 20/72+45/90