Add 15/28 and 20/40
15/28 + 20/40 is 29/28.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 28 and 40 is 280
Next, find the equivalent fraction of both fractional numbers with denominator 280 - For the 1st fraction, since 28 × 10 = 280,
15/28 = 15 × 10/28 × 10 = 150/280 - Likewise, for the 2nd fraction, since 40 × 7 = 280,
20/40 = 20 × 7/40 × 7 = 140/280 - Add the two like fractions:
150/280 + 140/280 = 150 + 140/280 = 290/280 - 290/280 simplified gives 29/28
- So, 15/28 + 20/40 = 29/28
In mixed form: 11/28
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 30/28+20/40 15/56+20/40 15/28+20/80 45/28+20/40 15/28+60/40 15/84+20/40 75/28+20/40