Add 20/90 and 70/12
1st number: 20/90, 2nd number: 5 10/12
20/90 + 70/12 is 109/18.
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,
20/90 = 20 × 2/90 × 2 = 40/180 - Likewise, for the 2nd fraction, since 12 × 15 = 180,
70/12 = 70 × 15/12 × 15 = 1050/180 - Add the two like fractions:
40/180 + 1050/180 = 40 + 1050/180 = 1090/180 - 1090/180 simplified gives 109/18
- So, 20/90 + 70/12 = 109/18
In mixed form: 61/18
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 40/90+70/12 20/90+70/24 60/90+70/12 20/90+70/36 20/90+70/60 20/90+70/84