Add 30/4 and 20/21
1st number: 7 2/4, 2nd number: 20/21
30/4 + 20/21 is 355/42.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 4 and 21 is 84
Next, find the equivalent fraction of both fractional numbers with denominator 84 - For the 1st fraction, since 4 × 21 = 84,
30/4 = 30 × 21/4 × 21 = 630/84 - Likewise, for the 2nd fraction, since 21 × 4 = 84,
20/21 = 20 × 4/21 × 4 = 80/84 - Add the two like fractions:
630/84 + 80/84 = 630 + 80/84 = 710/84 - 710/84 simplified gives 355/42
- So, 30/4 + 20/21 = 355/42
In mixed form: 819/42
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 60/4+20/21 30/4+40/21 30/8+20/21 30/4+20/42 90/4+20/21 30/4+60/21 30/12+20/21 30/4+20/63 30/20+20/21 30/28+20/21