Add 20/4 and 7/21
1st number: 5 0/4, 2nd number: 7/21
20/4 + 7/21 is 16/3.
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,
20/4 = 20 × 21/4 × 21 = 420/84 - Likewise, for the 2nd fraction, since 21 × 4 = 84,
7/21 = 7 × 4/21 × 4 = 28/84 - Add the two like fractions:
420/84 + 28/84 = 420 + 28/84 = 448/84 - 448/84 simplified gives 16/3
- So, 20/4 + 7/21 = 16/3
In mixed form: 51/3
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 40/4+7/21 20/4+14/21 20/8+7/21 20/4+7/42 60/4+7/21 20/12+7/21 20/4+7/63 20/4+35/21 20/4+49/21 20/28+7/21