Add 30/20 and 7/21
1st number: 1 10/20, 2nd number: 7/21
30/20 + 7/21 is 11/6.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 20 and 21 is 420
Next, find the equivalent fraction of both fractional numbers with denominator 420 - For the 1st fraction, since 20 × 21 = 420,
30/20 = 30 × 21/20 × 21 = 630/420 - Likewise, for the 2nd fraction, since 21 × 20 = 420,
7/21 = 7 × 20/21 × 20 = 140/420 - Add the two like fractions:
630/420 + 140/420 = 630 + 140/420 = 770/420 - 770/420 simplified gives 11/6
- So, 30/20 + 7/21 = 11/6
In mixed form: 15/6
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 60/20+7/21 30/20+14/21 30/40+7/21 30/20+7/42 90/20+7/21 30/60+7/21 30/20+7/63 30/20+35/21 30/20+49/21