Add 12/28 and 40/21
1st number: 12/28, 2nd number: 1 19/21
12/28 + 40/21 is 7/3.
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,
12/28 = 12 × 3/28 × 3 = 36/84 - Likewise, for the 2nd fraction, since 21 × 4 = 84,
40/21 = 40 × 4/21 × 4 = 160/84 - Add the two like fractions:
36/84 + 160/84 = 36 + 160/84 = 196/84 - 196/84 simplified gives 7/3
- So, 12/28 + 40/21 = 7/3
In mixed form: 21/3
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 24/28+40/21 12/28+80/21 12/56+40/21 12/28+40/42 36/28+40/21 12/84+40/21 12/28+40/63 60/28+40/21 84/28+40/21