Add 72/90 and 12/5
1st number: 72/90, 2nd number: 2 2/5
72/90 + 12/5 is 16/5.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 90 and 5 is 90
Next, find the equivalent fraction of both fractional numbers with denominator 90 - For the 1st fraction, since 90 × 1 = 90,
72/90 = 72 × 1/90 × 1 = 72/90 - Likewise, for the 2nd fraction, since 5 × 18 = 90,
12/5 = 12 × 18/5 × 18 = 216/90 - Add the two like fractions:
72/90 + 216/90 = 72 + 216/90 = 288/90 - 288/90 simplified gives 16/5
- So, 72/90 + 12/5 = 16/5
In mixed form: 31/5
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 72/90+24/5 72/90+12/10 72/90+36/5 72/90+12/15 72/90+60/5 72/90+12/25 72/90+84/5 72/90+12/35