Add 81/30 and 30/42
1st number: 2 21/30, 2nd number: 30/42
81/30 + 30/42 is 239/70.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 30 and 42 is 210
Next, find the equivalent fraction of both fractional numbers with denominator 210 - For the 1st fraction, since 30 × 7 = 210,
81/30 = 81 × 7/30 × 7 = 567/210 - Likewise, for the 2nd fraction, since 42 × 5 = 210,
30/42 = 30 × 5/42 × 5 = 150/210 - Add the two like fractions:
567/210 + 150/210 = 567 + 150/210 = 717/210 - 717/210 simplified gives 239/70
- So, 81/30 + 30/42 = 239/70
In mixed form: 329/70
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 81/30+60/42 81/60+30/42 81/30+30/84 81/30+90/42 81/90+30/42