Add 15/20 and 81/45
1st number: 15/20, 2nd number: 1 36/45
15/20 + 81/45 is 51/20.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 20 and 45 is 180
Next, find the equivalent fraction of both fractional numbers with denominator 180 - For the 1st fraction, since 20 × 9 = 180,
15/20 = 15 × 9/20 × 9 = 135/180 - Likewise, for the 2nd fraction, since 45 × 4 = 180,
81/45 = 81 × 4/45 × 4 = 324/180 - Add the two like fractions:
135/180 + 324/180 = 135 + 324/180 = 459/180 - 459/180 simplified gives 51/20
- So, 15/20 + 81/45 = 51/20
In mixed form: 211/20
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 30/20+81/45 15/40+81/45 15/20+81/90 45/20+81/45 15/60+81/45 75/20+81/45