Add 15/10 and 81/72
1st number: 1 5/10, 2nd number: 1 9/72
15/10 + 81/72 is 21/8.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 10 and 72 is 360
Next, find the equivalent fraction of both fractional numbers with denominator 360 - For the 1st fraction, since 10 × 36 = 360,
15/10 = 15 × 36/10 × 36 = 540/360 - Likewise, for the 2nd fraction, since 72 × 5 = 360,
81/72 = 81 × 5/72 × 5 = 405/360 - Add the two like fractions:
540/360 + 405/360 = 540 + 405/360 = 945/360 - 945/360 simplified gives 21/8
- So, 15/10 + 81/72 = 21/8
In mixed form: 25/8
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 30/10+81/72 15/20+81/72 45/10+81/72 15/30+81/72 75/10+81/72 15/50+81/72 15/70+81/72