Add 72/45 and 3/20
1st number: 1 27/45, 2nd number: 3/20
72/45 + 3/20 is 7/4.
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,
72/45 = 72 × 4/45 × 4 = 288/180 - Likewise, for the 2nd fraction, since 20 × 9 = 180,
3/20 = 3 × 9/20 × 9 = 27/180 - Add the two like fractions:
288/180 + 27/180 = 288 + 27/180 = 315/180 - 315/180 simplified gives 7/4
- So, 72/45 + 3/20 = 7/4
In mixed form: 13/4
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 72/45+6/20 72/90+3/20 72/45+3/40 72/45+9/20 72/45+3/60 72/45+15/20 72/45+21/20