Add 15/20 and 35/40
15/20 + 35/40 is 13/8.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 20 and 40 is 40
Next, find the equivalent fraction of both fractional numbers with denominator 40 - For the 1st fraction, since 20 × 2 = 40,
15/20 = 15 × 2/20 × 2 = 30/40 - Likewise, for the 2nd fraction, since 40 × 1 = 40,
35/40 = 35 × 1/40 × 1 = 35/40 - Add the two like fractions:
30/40 + 35/40 = 30 + 35/40 = 65/40 - 65/40 simplified gives 13/8
- So, 15/20 + 35/40 = 13/8
In mixed form: 15/8
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 30/20+35/40 15/20+70/40 15/40+35/40 15/20+35/80 45/20+35/40 15/60+35/40 75/20+35/40