Add 15/8 and 81/72
1st number: 1 7/8, 2nd number: 1 9/72
15/8 + 81/72 is 3/1.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 8 and 72 is 72
Next, find the equivalent fraction of both fractional numbers with denominator 72 - For the 1st fraction, since 8 × 9 = 72,
15/8 = 15 × 9/8 × 9 = 135/72 - Likewise, for the 2nd fraction, since 72 × 1 = 72,
81/72 = 81 × 1/72 × 1 = 81/72 - Add the two like fractions:
135/72 + 81/72 = 135 + 81/72 = 216/72 - 216/72 simplified gives 3/1
- So, 15/8 + 81/72 = 3/1
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 30/8+81/72 15/16+81/72 45/8+81/72 15/24+81/72 75/8+81/72 15/40+81/72 15/56+81/72