Add 15/40 and 42/60
15/40 + 42/60 is 43/40.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 40 and 60 is 120
Next, find the equivalent fraction of both fractional numbers with denominator 120 - For the 1st fraction, since 40 × 3 = 120,
15/40 = 15 × 3/40 × 3 = 45/120 - Likewise, for the 2nd fraction, since 60 × 2 = 120,
42/60 = 42 × 2/60 × 2 = 84/120 - Add the two like fractions:
45/120 + 84/120 = 45 + 84/120 = 129/120 - 129/120 simplified gives 43/40
- So, 15/40 + 42/60 = 43/40
In mixed form: 13/40
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 30/40+42/60 15/40+84/60 15/80+42/60 45/40+42/60 75/40+42/60