Add 12/20 and 81/70
1st number: 12/20, 2nd number: 1 11/70
12/20 + 81/70 is 123/70.
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,
81/70 = 81 × 2/70 × 2 = 162/140 - Add the two like fractions:
84/140 + 162/140 = 84 + 162/140 = 246/140 - 246/140 simplified gives 123/70
- So, 12/20 + 81/70 = 123/70
In mixed form: 153/70
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 24/20+81/70 12/40+81/70 36/20+81/70 12/60+81/70 60/20+81/70 84/20+81/70