Add 15/72 and 81/40
1st number: 15/72, 2nd number: 2 1/40
15/72 + 81/40 is 67/30.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 72 and 40 is 360
Next, find the equivalent fraction of both fractional numbers with denominator 360 - For the 1st fraction, since 72 × 5 = 360,
15/72 = 15 × 5/72 × 5 = 75/360 - Likewise, for the 2nd fraction, since 40 × 9 = 360,
81/40 = 81 × 9/40 × 9 = 729/360 - Add the two like fractions:
75/360 + 729/360 = 75 + 729/360 = 804/360 - 804/360 simplified gives 67/30
- So, 15/72 + 81/40 = 67/30
In mixed form: 27/30
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 30/72+81/40 15/72+81/80 45/72+81/40 75/72+81/40