Add 4/28 and 84/21
1st number: 4/28, 2nd number: 4 0/21
4/28 + 84/21 is 29/7.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 28 and 21 is 84
Next, find the equivalent fraction of both fractional numbers with denominator 84 - For the 1st fraction, since 28 × 3 = 84,
4/28 = 4 × 3/28 × 3 = 12/84 - Likewise, for the 2nd fraction, since 21 × 4 = 84,
84/21 = 84 × 4/21 × 4 = 336/84 - Add the two like fractions:
12/84 + 336/84 = 12 + 336/84 = 348/84 - 348/84 simplified gives 29/7
- So, 4/28 + 84/21 = 29/7
In mixed form: 41/7
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 8/28+84/21 4/56+84/21 4/28+84/42 12/28+84/21 4/84+84/21 4/28+84/63 20/28+84/21