Add 21/40 and 2/12
21/40 + 2/12 is 83/120.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 40 and 12 is 120
Next, find the equivalent fraction of both fractional numbers with denominator 120 - For the 1st fraction, since 40 × 3 = 120,
21/40 = 21 × 3/40 × 3 = 63/120 - Likewise, for the 2nd fraction, since 12 × 10 = 120,
2/12 = 2 × 10/12 × 10 = 20/120 - Add the two like fractions:
63/120 + 20/120 = 63 + 20/120 = 83/120 - So, 21/40 + 2/12 = 83/120
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 42/40+2/12 21/40+4/12 21/80+2/12 21/40+2/24 63/40+2/12 21/40+6/12 21/40+2/36 21/40+10/12 21/40+2/60 21/40+14/12 21/40+2/84