Add 81/4 and 8/5
1st number: 20 1/4, 2nd number: 1 3/5
81/4 + 8/5 is 437/20.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 4 and 5 is 20
Next, find the equivalent fraction of both fractional numbers with denominator 20 - For the 1st fraction, since 4 × 5 = 20,
81/4 = 81 × 5/4 × 5 = 405/20 - Likewise, for the 2nd fraction, since 5 × 4 = 20,
8/5 = 8 × 4/5 × 4 = 32/20 - Add the two like fractions:
405/20 + 32/20 = 405 + 32/20 = 437/20 - So, 81/4 + 8/5 = 437/20
In mixed form: 2117/20
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 81/4+16/5 81/8+8/5 81/4+8/10 81/4+24/5 81/12+8/5 81/4+8/15 81/4+40/5 81/20+8/5 81/4+8/25 81/4+56/5 81/28+8/5 81/4+8/35