Add 81/4 and 42/10
1st number: 20 1/4, 2nd number: 4 2/10
81/4 + 42/10 is 489/20.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 4 and 10 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 10 × 2 = 20,
42/10 = 42 × 2/10 × 2 = 84/20 - Add the two like fractions:
405/20 + 84/20 = 405 + 84/20 = 489/20 - So, 81/4 + 42/10 = 489/20
In mixed form: 249/20
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 81/4+84/10 81/8+42/10 81/4+42/20 81/12+42/10 81/4+42/30 81/20+42/10 81/4+42/50 81/28+42/10 81/4+42/70