Add 56/28 and 45/21
1st number: 2 0/28, 2nd number: 2 3/21
56/28 + 45/21 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,
56/28 = 56 × 3/28 × 3 = 168/84 - Likewise, for the 2nd fraction, since 21 × 4 = 84,
45/21 = 45 × 4/21 × 4 = 180/84 - Add the two like fractions:
168/84 + 180/84 = 168 + 180/84 = 348/84 - 348/84 simplified gives 29/7
- So, 56/28 + 45/21 = 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: 56/28+90/21 56/28+45/42 56/84+45/21 56/28+45/63