Add 40/28 and 24/21
1st number: 1 12/28, 2nd number: 1 3/21
40/28 + 24/21 is 18/7.
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,
40/28 = 40 × 3/28 × 3 = 120/84 - Likewise, for the 2nd fraction, since 21 × 4 = 84,
24/21 = 24 × 4/21 × 4 = 96/84 - Add the two like fractions:
120/84 + 96/84 = 120 + 96/84 = 216/84 - 216/84 simplified gives 18/7
- So, 40/28 + 24/21 = 18/7
In mixed form: 24/7
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 80/28+24/21 40/28+48/21 40/56+24/21 40/28+24/42 40/28+72/21 40/84+24/21 40/28+24/63