Add 81/20 and 42/7
1st number: 4 1/20, 2nd number: 6 0/7
81/20 + 42/7 is 201/20.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 20 and 7 is 140
Next, find the equivalent fraction of both fractional numbers with denominator 140 - For the 1st fraction, since 20 × 7 = 140,
81/20 = 81 × 7/20 × 7 = 567/140 - Likewise, for the 2nd fraction, since 7 × 20 = 140,
42/7 = 42 × 20/7 × 20 = 840/140 - Add the two like fractions:
567/140 + 840/140 = 567 + 840/140 = 1407/140 - 1407/140 simplified gives 201/20
- So, 81/20 + 42/7 = 201/20
In mixed form: 101/20
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 81/20+84/7 81/40+42/7 81/20+42/14 81/60+42/7 81/20+42/21 81/20+42/35 81/20+42/49