Add 12/20 and 42/7
1st number: 12/20, 2nd number: 6 0/7
12/20 + 42/7 is 33/5.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 20 and 7 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 7 × 20 = 140,
42/7 = 42 × 20/7 × 20 = 840/140 - Add the two like fractions:
84/140 + 840/140 = 84 + 840/140 = 924/140 - 924/140 simplified gives 33/5
- So, 12/20 + 42/7 = 33/5
In mixed form: 63/5
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 24/20+42/7 12/20+84/7 12/40+42/7 12/20+42/14 36/20+42/7 12/60+42/7 12/20+42/21 60/20+42/7 12/20+42/35 84/20+42/7 12/20+42/49