Add 70/90 and 7/20
70/90 + 7/20 is 203/180.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 90 and 20 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 20 × 9 = 180,
7/20 = 7 × 9/20 × 9 = 63/180 - Add the two like fractions:
140/180 + 63/180 = 140 + 63/180 = 203/180 - So, 70/90 + 7/20 = 203/180
In mixed form: 123/180
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 70/90+14/20 70/90+7/40 70/90+21/20 70/90+7/60 70/90+35/20 70/90+49/20