Add 10/40 and 12/30
10/40 + 12/30 is 13/20.
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,
10/40 = 10 × 3/40 × 3 = 30/120 - Likewise, for the 2nd fraction, since 30 × 4 = 120,
12/30 = 12 × 4/30 × 4 = 48/120 - Add the two like fractions:
30/120 + 48/120 = 30 + 48/120 = 78/120 - 78/120 simplified gives 13/20
- So, 10/40 + 12/30 = 13/20
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 20/40+12/30 10/40+24/30 10/80+12/30 10/40+12/60 30/40+12/30 10/40+36/30 10/40+12/90 50/40+12/30 10/40+60/30 70/40+12/30 10/40+84/30