Add 8/28 and 40/21
1st number: 8/28, 2nd number: 1 19/21
8/28 + 40/21 is 46/21.
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,
8/28 = 8 × 3/28 × 3 = 24/84 - Likewise, for the 2nd fraction, since 21 × 4 = 84,
40/21 = 40 × 4/21 × 4 = 160/84 - Add the two like fractions:
24/84 + 160/84 = 24 + 160/84 = 184/84 - 184/84 simplified gives 46/21
- So, 8/28 + 40/21 = 46/21
In mixed form: 24/21
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 16/28+40/21 8/28+80/21 8/56+40/21 8/28+40/42 24/28+40/21 8/84+40/21 8/28+40/63 40/28+40/21 56/28+40/21