Add 81/72 and 80/30
1st number: 1 9/72, 2nd number: 2 20/30
81/72 + 80/30 is 91/24.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 72 and 30 is 360
Next, find the equivalent fraction of both fractional numbers with denominator 360 - For the 1st fraction, since 72 × 5 = 360,
81/72 = 81 × 5/72 × 5 = 405/360 - Likewise, for the 2nd fraction, since 30 × 12 = 360,
80/30 = 80 × 12/30 × 12 = 960/360 - Add the two like fractions:
405/360 + 960/360 = 405 + 960/360 = 1365/360 - 1365/360 simplified gives 91/24
- So, 81/72 + 80/30 = 91/24
In mixed form: 319/24
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 81/72+80/60 81/72+80/90