Add 30/70 and 7/20
30/70 + 7/20 is 109/140.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 70 and 20 is 140
Next, find the equivalent fraction of both fractional numbers with denominator 140 - For the 1st fraction, since 70 × 2 = 140,
30/70 = 30 × 2/70 × 2 = 60/140 - Likewise, for the 2nd fraction, since 20 × 7 = 140,
7/20 = 7 × 7/20 × 7 = 49/140 - Add the two like fractions:
60/140 + 49/140 = 60 + 49/140 = 109/140 - So, 30/70 + 7/20 = 109/140
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 60/70+7/20 30/70+14/20 30/70+7/40 90/70+7/20 30/70+21/20 30/70+7/60 30/70+35/20 30/70+49/20