Add 8/42 and 81/30
1st number: 8/42, 2nd number: 2 21/30
8/42 + 81/30 is 607/210.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 42 and 30 is 210
Next, find the equivalent fraction of both fractional numbers with denominator 210 - For the 1st fraction, since 42 × 5 = 210,
8/42 = 8 × 5/42 × 5 = 40/210 - Likewise, for the 2nd fraction, since 30 × 7 = 210,
81/30 = 81 × 7/30 × 7 = 567/210 - Add the two like fractions:
40/210 + 567/210 = 40 + 567/210 = 607/210 - So, 8/42 + 81/30 = 607/210
In mixed form: 2187/210
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 16/42+81/30 8/84+81/30 8/42+81/60 24/42+81/30 8/42+81/90 40/42+81/30 56/42+81/30