Add 9/28 and 28/40
9/28 + 28/40 is 143/140.
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,
9/28 = 9 × 10/28 × 10 = 90/280 - Likewise, for the 2nd fraction, since 40 × 7 = 280,
28/40 = 28 × 7/40 × 7 = 196/280 - Add the two like fractions:
90/280 + 196/280 = 90 + 196/280 = 286/280 - 286/280 simplified gives 143/140
- So, 9/28 + 28/40 = 143/140
In mixed form: 13/140
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 18/28+28/40 9/28+56/40 9/56+28/40 9/28+28/80 27/28+28/40 9/28+84/40 9/84+28/40 45/28+28/40 63/28+28/40