Add 90/20 and 70/90
1st number: 4 10/20, 2nd number: 70/90
90/20 + 70/90 is 95/18.
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,
90/20 = 90 × 9/20 × 9 = 810/180 - Likewise, for the 2nd fraction, since 90 × 2 = 180,
70/90 = 70 × 2/90 × 2 = 140/180 - Add the two like fractions:
810/180 + 140/180 = 810 + 140/180 = 950/180 - 950/180 simplified gives 95/18
- So, 90/20 + 70/90 = 95/18
In mixed form: 55/18
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 90/40+70/90 90/60+70/90