Add 30/80 and 70/20
1st number: 30/80, 2nd number: 3 10/20
30/80 + 70/20 is 31/8.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 80 and 20 is 80
Next, find the equivalent fraction of both fractional numbers with denominator 80 - For the 1st fraction, since 80 × 1 = 80,
30/80 = 30 × 1/80 × 1 = 30/80 - Likewise, for the 2nd fraction, since 20 × 4 = 80,
70/20 = 70 × 4/20 × 4 = 280/80 - Add the two like fractions:
30/80 + 280/80 = 30 + 280/80 = 310/80 - 310/80 simplified gives 31/8
- So, 30/80 + 70/20 = 31/8
In mixed form: 37/8
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 60/80+70/20 30/80+70/40 90/80+70/20 30/80+70/60