Add 15/40 and 20/28
15/40 + 20/28 is 61/56.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 40 and 28 is 280
Next, find the equivalent fraction of both fractional numbers with denominator 280 - For the 1st fraction, since 40 × 7 = 280,
15/40 = 15 × 7/40 × 7 = 105/280 - Likewise, for the 2nd fraction, since 28 × 10 = 280,
20/28 = 20 × 10/28 × 10 = 200/280 - Add the two like fractions:
105/280 + 200/280 = 105 + 200/280 = 305/280 - 305/280 simplified gives 61/56
- So, 15/40 + 20/28 = 61/56
In mixed form: 15/56
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 30/40+20/28 15/40+40/28 15/80+20/28 15/40+20/56 45/40+20/28 15/40+60/28 15/40+20/84 75/40+20/28