Add 72/40 and 28/9
1st number: 1 32/40, 2nd number: 3 1/9
72/40 + 28/9 is 221/45.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 40 and 9 is 360
Next, find the equivalent fraction of both fractional numbers with denominator 360 - For the 1st fraction, since 40 × 9 = 360,
72/40 = 72 × 9/40 × 9 = 648/360 - Likewise, for the 2nd fraction, since 9 × 40 = 360,
28/9 = 28 × 40/9 × 40 = 1120/360 - Add the two like fractions:
648/360 + 1120/360 = 648 + 1120/360 = 1768/360 - 1768/360 simplified gives 221/45
- So, 72/40 + 28/9 = 221/45
In mixed form: 441/45
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 72/40+56/9 72/80+28/9 72/40+28/18 72/40+84/9 72/40+28/27 72/40+28/45 72/40+28/63