Add 70/90 and 20/12
1st number: 70/90, 2nd number: 1 8/12
70/90 + 20/12 is 22/9.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 90 and 12 is 180
Next, find the equivalent fraction of both fractional numbers with denominator 180 - For the 1st fraction, since 90 × 2 = 180,
70/90 = 70 × 2/90 × 2 = 140/180 - Likewise, for the 2nd fraction, since 12 × 15 = 180,
20/12 = 20 × 15/12 × 15 = 300/180 - Add the two like fractions:
140/180 + 300/180 = 140 + 300/180 = 440/180 - 440/180 simplified gives 22/9
- So, 70/90 + 20/12 = 22/9
In mixed form: 24/9
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 70/90+40/12 70/90+20/24 70/90+60/12 70/90+20/36 70/90+20/60 70/90+20/84