Add 15/28 and 40/20
1st number: 15/28, 2nd number: 2 0/20
15/28 + 40/20 is 71/28.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 28 and 20 is 140
Next, find the equivalent fraction of both fractional numbers with denominator 140 - For the 1st fraction, since 28 × 5 = 140,
15/28 = 15 × 5/28 × 5 = 75/140 - Likewise, for the 2nd fraction, since 20 × 7 = 140,
40/20 = 40 × 7/20 × 7 = 280/140 - Add the two like fractions:
75/140 + 280/140 = 75 + 280/140 = 355/140 - 355/140 simplified gives 71/28
- So, 15/28 + 40/20 = 71/28
In mixed form: 215/28
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 30/28+40/20 15/28+80/20 15/56+40/20 45/28+40/20 15/84+40/20 15/28+40/60 75/28+40/20