Add 15/80 and 45/40
1st number: 15/80, 2nd number: 1 5/40
15/80 + 45/40 is 21/16.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 80 and 40 is 80
Next, find the equivalent fraction of both fractional numbers with denominator 80 - For the 1st fraction, since 80 × 1 = 80,
15/80 = 15 × 1/80 × 1 = 15/80 - Likewise, for the 2nd fraction, since 40 × 2 = 80,
45/40 = 45 × 2/40 × 2 = 90/80 - Add the two like fractions:
15/80 + 90/80 = 15 + 90/80 = 105/80 - 105/80 simplified gives 21/16
- So, 15/80 + 45/40 = 21/16
In mixed form: 15/16
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 30/80+45/40 15/80+90/40 15/80+45/80 45/80+45/40 75/80+45/40