Add 15/4 and 20/5
1st number: 3 3/4, 2nd number: 4 0/5
15/4 + 20/5 is 31/4.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 4 and 5 is 20
Next, find the equivalent fraction of both fractional numbers with denominator 20 - For the 1st fraction, since 4 × 5 = 20,
15/4 = 15 × 5/4 × 5 = 75/20 - Likewise, for the 2nd fraction, since 5 × 4 = 20,
20/5 = 20 × 4/5 × 4 = 80/20 - Add the two like fractions:
75/20 + 80/20 = 75 + 80/20 = 155/20 - 155/20 simplified gives 31/4
- So, 15/4 + 20/5 = 31/4
In mixed form: 73/4
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 30/4+20/5 15/4+40/5 15/8+20/5 15/4+20/10 45/4+20/5 15/4+60/5 15/12+20/5 15/4+20/15 75/4+20/5 15/20+20/5 15/4+20/25 15/28+20/5 15/4+20/35