Add 28/56 and 40/90
28/56 + 40/90 is 17/18.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 56 and 90 is 2520
Next, find the equivalent fraction of both fractional numbers with denominator 2520 - For the 1st fraction, since 56 × 45 = 2520,
28/56 = 28 × 45/56 × 45 = 1260/2520 - Likewise, for the 2nd fraction, since 90 × 28 = 2520,
40/90 = 40 × 28/90 × 28 = 1120/2520 - Add the two like fractions:
1260/2520 + 1120/2520 = 1260 + 1120/2520 = 2380/2520 - 2380/2520 simplified gives 17/18
- So, 28/56 + 40/90 = 17/18
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 28/56+80/90 84/56+40/90