Add 15/40 and 15/8
1st number: 15/40, 2nd number: 1 7/8
15/40 + 15/8 is 9/4.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 40 and 8 is 40
Next, find the equivalent fraction of both fractional numbers with denominator 40 - For the 1st fraction, since 40 × 1 = 40,
15/40 = 15 × 1/40 × 1 = 15/40 - Likewise, for the 2nd fraction, since 8 × 5 = 40,
15/8 = 15 × 5/8 × 5 = 75/40 - Add the two like fractions:
15/40 + 75/40 = 15 + 75/40 = 90/40 - 90/40 simplified gives 9/4
- So, 15/40 + 15/8 = 9/4
In mixed form: 21/4
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 30/40+15/8 15/40+30/8 15/80+15/8 15/40+15/16 45/40+15/8 15/40+45/8 15/40+15/24 75/40+15/8 15/40+75/8 15/40+15/40 15/40+15/56