Add 28/20 and 70/90
1st number: 1 8/20, 2nd number: 70/90
28/20 + 70/90 is 98/45.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 20 and 90 is 180
Next, find the equivalent fraction of both fractional numbers with denominator 180 - For the 1st fraction, since 20 × 9 = 180,
28/20 = 28 × 9/20 × 9 = 252/180 - Likewise, for the 2nd fraction, since 90 × 2 = 180,
70/90 = 70 × 2/90 × 2 = 140/180 - Add the two like fractions:
252/180 + 140/180 = 252 + 140/180 = 392/180 - 392/180 simplified gives 98/45
- So, 28/20 + 70/90 = 98/45
In mixed form: 28/45
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 56/20+70/90 28/40+70/90 84/20+70/90 28/60+70/90