Add 90/20 and 7/30
1st number: 4 10/20, 2nd number: 7/30
90/20 + 7/30 is 71/15.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 20 and 30 is 60
Next, find the equivalent fraction of both fractional numbers with denominator 60 - For the 1st fraction, since 20 × 3 = 60,
90/20 = 90 × 3/20 × 3 = 270/60 - Likewise, for the 2nd fraction, since 30 × 2 = 60,
7/30 = 7 × 2/30 × 2 = 14/60 - Add the two like fractions:
270/60 + 14/60 = 270 + 14/60 = 284/60 - 284/60 simplified gives 71/15
- So, 90/20 + 7/30 = 71/15
In mixed form: 411/15
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 90/20+14/30 90/40+7/30 90/20+7/60 90/20+21/30 90/60+7/30 90/20+7/90 90/20+35/30 90/20+49/30