Add 15/30 and 12/40
15/30 + 12/40 is 4/5.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 30 and 40 is 120
Next, find the equivalent fraction of both fractional numbers with denominator 120 - For the 1st fraction, since 30 × 4 = 120,
15/30 = 15 × 4/30 × 4 = 60/120 - Likewise, for the 2nd fraction, since 40 × 3 = 120,
12/40 = 12 × 3/40 × 3 = 36/120 - Add the two like fractions:
60/120 + 36/120 = 60 + 36/120 = 96/120 - 96/120 simplified gives 4/5
- So, 15/30 + 12/40 = 4/5
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 15/30+24/40 15/60+12/40 15/30+12/80 45/30+12/40 15/30+36/40 15/90+12/40 75/30+12/40 15/30+60/40 15/30+84/40