Add 81/42 and 4/30
1st number: 1 39/42, 2nd number: 4/30
81/42 + 4/30 is 433/210.
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,
81/42 = 81 × 5/42 × 5 = 405/210 - Likewise, for the 2nd fraction, since 30 × 7 = 210,
4/30 = 4 × 7/30 × 7 = 28/210 - Add the two like fractions:
405/210 + 28/210 = 405 + 28/210 = 433/210 - So, 81/42 + 4/30 = 433/210
In mixed form: 213/210
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 81/42+8/30 81/84+4/30 81/42+4/60 81/42+12/30 81/42+4/90 81/42+20/30 81/42+28/30