Add 70/9 and 18/20
1st number: 7 7/9, 2nd number: 18/20
70/9 + 18/20 is 781/90.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 9 and 20 is 180
Next, find the equivalent fraction of both fractional numbers with denominator 180 - For the 1st fraction, since 9 × 20 = 180,
70/9 = 70 × 20/9 × 20 = 1400/180 - Likewise, for the 2nd fraction, since 20 × 9 = 180,
18/20 = 18 × 9/20 × 9 = 162/180 - Add the two like fractions:
1400/180 + 162/180 = 1400 + 162/180 = 1562/180 - 1562/180 simplified gives 781/90
- So, 70/9 + 18/20 = 781/90
In mixed form: 861/90
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 70/9+36/20 70/18+18/20 70/9+18/40 70/9+54/20 70/27+18/20 70/9+18/60 70/9+90/20 70/45+18/20 70/63+18/20