Add 72/18 and 45/30
1st number: 4 0/18, 2nd number: 1 15/30
72/18 + 45/30 is 11/2.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 18 and 30 is 90
Next, find the equivalent fraction of both fractional numbers with denominator 90 - For the 1st fraction, since 18 × 5 = 90,
72/18 = 72 × 5/18 × 5 = 360/90 - Likewise, for the 2nd fraction, since 30 × 3 = 90,
45/30 = 45 × 3/30 × 3 = 135/90 - Add the two like fractions:
360/90 + 135/90 = 360 + 135/90 = 495/90 - 495/90 simplified gives 11/2
- So, 72/18 + 45/30 = 11/2
In mixed form: 51/2
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 72/18+90/30 72/36+45/30 72/18+45/60 72/54+45/30 72/18+45/90 72/90+45/30