Add 15/40 and 3/30
15/40 + 3/30 is 19/40.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 40 and 30 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 30 × 4 = 120,
3/30 = 3 × 4/30 × 4 = 12/120 - Add the two like fractions:
45/120 + 12/120 = 45 + 12/120 = 57/120 - 57/120 simplified gives 19/40
- So, 15/40 + 3/30 = 19/40
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 30/40+3/30 15/40+6/30 15/80+3/30 15/40+3/60 45/40+3/30 15/40+9/30 15/40+3/90 75/40+3/30 15/40+15/30 15/40+21/30