Add 81/80 and 40/5
1st number: 1 1/80, 2nd number: 8 0/5
81/80 + 40/5 is 721/80.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 80 and 5 is 80
Next, find the equivalent fraction of both fractional numbers with denominator 80 - For the 1st fraction, since 80 × 1 = 80,
81/80 = 81 × 1/80 × 1 = 81/80 - Likewise, for the 2nd fraction, since 5 × 16 = 80,
40/5 = 40 × 16/5 × 16 = 640/80 - Add the two like fractions:
81/80 + 640/80 = 81 + 640/80 = 721/80 - So, 81/80 + 40/5 = 721/80
In mixed form: 91/80
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 81/80+80/5 81/80+40/10 81/80+40/15 81/80+40/25 81/80+40/35