Add 15/28 and 40/42
15/28 + 40/42 is 125/84.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 28 and 42 is 84
Next, find the equivalent fraction of both fractional numbers with denominator 84 - For the 1st fraction, since 28 × 3 = 84,
15/28 = 15 × 3/28 × 3 = 45/84 - Likewise, for the 2nd fraction, since 42 × 2 = 84,
40/42 = 40 × 2/42 × 2 = 80/84 - Add the two like fractions:
45/84 + 80/84 = 45 + 80/84 = 125/84 - So, 15/28 + 40/42 = 125/84
In mixed form: 141/84
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 30/28+40/42 15/28+80/42 15/56+40/42 15/28+40/84 45/28+40/42 15/84+40/42 75/28+40/42