Add 30/45 and 72/20
1st number: 30/45, 2nd number: 3 12/20
30/45 + 72/20 is 64/15.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 45 and 20 is 180
Next, find the equivalent fraction of both fractional numbers with denominator 180 - For the 1st fraction, since 45 × 4 = 180,
30/45 = 30 × 4/45 × 4 = 120/180 - Likewise, for the 2nd fraction, since 20 × 9 = 180,
72/20 = 72 × 9/20 × 9 = 648/180 - Add the two like fractions:
120/180 + 648/180 = 120 + 648/180 = 768/180 - 768/180 simplified gives 64/15
- So, 30/45 + 72/20 = 64/15
In mixed form: 44/15
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 60/45+72/20 30/90+72/20 30/45+72/40 90/45+72/20 30/45+72/60