Add 30/20 and 21/70
1st number: 1 10/20, 2nd number: 21/70
30/20 + 21/70 is 9/5.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 20 and 70 is 140
Next, find the equivalent fraction of both fractional numbers with denominator 140 - For the 1st fraction, since 20 × 7 = 140,
30/20 = 30 × 7/20 × 7 = 210/140 - Likewise, for the 2nd fraction, since 70 × 2 = 140,
21/70 = 21 × 2/70 × 2 = 42/140 - Add the two like fractions:
210/140 + 42/140 = 210 + 42/140 = 252/140 - 252/140 simplified gives 9/5
- So, 30/20 + 21/70 = 9/5
In mixed form: 14/5
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 60/20+21/70 30/20+42/70 30/40+21/70 90/20+21/70 30/20+63/70 30/60+21/70