Add 30/70 and 28/30
30/70 + 28/30 is 143/105.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 70 and 30 is 210
Next, find the equivalent fraction of both fractional numbers with denominator 210 - For the 1st fraction, since 70 × 3 = 210,
30/70 = 30 × 3/70 × 3 = 90/210 - Likewise, for the 2nd fraction, since 30 × 7 = 210,
28/30 = 28 × 7/30 × 7 = 196/210 - Add the two like fractions:
90/210 + 196/210 = 90 + 196/210 = 286/210 - 286/210 simplified gives 143/105
- So, 30/70 + 28/30 = 143/105
In mixed form: 138/105
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 60/70+28/30 30/70+56/30 30/70+28/60 90/70+28/30 30/70+84/30 30/70+28/90