Add 12/20 and 12/42
12/20 + 12/42 is 31/35.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 20 and 42 is 420
Next, find the equivalent fraction of both fractional numbers with denominator 420 - For the 1st fraction, since 20 × 21 = 420,
12/20 = 12 × 21/20 × 21 = 252/420 - Likewise, for the 2nd fraction, since 42 × 10 = 420,
12/42 = 12 × 10/42 × 10 = 120/420 - Add the two like fractions:
252/420 + 120/420 = 252 + 120/420 = 372/420 - 372/420 simplified gives 31/35
- So, 12/20 + 12/42 = 31/35
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 24/20+12/42 12/20+24/42 12/40+12/42 12/20+12/84 36/20+12/42 12/20+36/42 12/60+12/42 60/20+12/42 12/20+60/42 84/20+12/42 12/20+84/42