Add 81/20 and 12/70
1st number: 4 1/20, 2nd number: 12/70
81/20 + 12/70 is 591/140.
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,
81/20 = 81 × 7/20 × 7 = 567/140 - Likewise, for the 2nd fraction, since 70 × 2 = 140,
12/70 = 12 × 2/70 × 2 = 24/140 - Add the two like fractions:
567/140 + 24/140 = 567 + 24/140 = 591/140 - So, 81/20 + 12/70 = 591/140
In mixed form: 431/140
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 81/20+24/70 81/40+12/70 81/20+36/70 81/60+12/70 81/20+60/70 81/20+84/70