Add 81/30 and 70/12
1st number: 2 21/30, 2nd number: 5 10/12
81/30 + 70/12 is 128/15.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 30 and 12 is 60
Next, find the equivalent fraction of both fractional numbers with denominator 60 - For the 1st fraction, since 30 × 2 = 60,
81/30 = 81 × 2/30 × 2 = 162/60 - Likewise, for the 2nd fraction, since 12 × 5 = 60,
70/12 = 70 × 5/12 × 5 = 350/60 - Add the two like fractions:
162/60 + 350/60 = 162 + 350/60 = 512/60 - 512/60 simplified gives 128/15
- So, 81/30 + 70/12 = 128/15
In mixed form: 88/15
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 81/60+70/12 81/30+70/24 81/90+70/12 81/30+70/36 81/30+70/60 81/30+70/84