Add 12/20 and 42/70
12/20 + 42/70 is 6/5.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 20 and 70 is 140
Next, find the equivalent fraction of both fractional numbers with denominator 140 - For the 1st fraction, since 20 × 7 = 140,
12/20 = 12 × 7/20 × 7 = 84/140 - Likewise, for the 2nd fraction, since 70 × 2 = 140,
42/70 = 42 × 2/70 × 2 = 84/140 - Add the two like fractions:
84/140 + 84/140 = 84 + 84/140 = 168/140 - 168/140 simplified gives 6/5
- So, 12/20 + 42/70 = 6/5
In mixed form: 11/5
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 24/20+42/70 12/20+84/70 12/40+42/70 36/20+42/70 12/60+42/70 60/20+42/70 84/20+42/70