Add 40/45 and 15/80
40/45 + 15/80 is 155/144.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 45 and 80 is 720
Next, find the equivalent fraction of both fractional numbers with denominator 720 - For the 1st fraction, since 45 × 16 = 720,
40/45 = 40 × 16/45 × 16 = 640/720 - Likewise, for the 2nd fraction, since 80 × 9 = 720,
15/80 = 15 × 9/80 × 9 = 135/720 - Add the two like fractions:
640/720 + 135/720 = 640 + 135/720 = 775/720 - 775/720 simplified gives 155/144
- So, 40/45 + 15/80 = 155/144
In mixed form: 111/144
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 80/45+15/80 40/45+30/80 40/90+15/80 40/45+45/80 40/45+75/80