Add 4/28 and 40/21
1st number: 4/28, 2nd number: 1 19/21
4/28 + 40/21 is 43/21.
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,
40/21 = 40 × 4/21 × 4 = 160/84 - Add the two like fractions:
12/84 + 160/84 = 12 + 160/84 = 172/84 - 172/84 simplified gives 43/21
- So, 4/28 + 40/21 = 43/21
In mixed form: 21/21
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 8/28+40/21 4/28+80/21 4/56+40/21 4/28+40/42 12/28+40/21 4/84+40/21 4/28+40/63 20/28+40/21