Add 72/20 and 3/45
1st number: 3 12/20, 2nd number: 3/45
72/20 + 3/45 is 11/3.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 20 and 45 is 180
Next, find the equivalent fraction of both fractional numbers with denominator 180 - For the 1st fraction, since 20 × 9 = 180,
72/20 = 72 × 9/20 × 9 = 648/180 - Likewise, for the 2nd fraction, since 45 × 4 = 180,
3/45 = 3 × 4/45 × 4 = 12/180 - Add the two like fractions:
648/180 + 12/180 = 648 + 12/180 = 660/180 - 660/180 simplified gives 11/3
- So, 72/20 + 3/45 = 11/3
In mixed form: 32/3
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 72/20+6/45 72/40+3/45 72/20+3/90 72/20+9/45 72/60+3/45 72/20+15/45 72/20+21/45