Add 1/21 and 42/30
1st number: 1/21, 2nd number: 1 12/30
1/21 + 42/30 is 152/105.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 21 and 30 is 210
Next, find the equivalent fraction of both fractional numbers with denominator 210 - For the 1st fraction, since 21 × 10 = 210,
1/21 = 1 × 10/21 × 10 = 10/210 - Likewise, for the 2nd fraction, since 30 × 7 = 210,
42/30 = 42 × 7/30 × 7 = 294/210 - Add the two like fractions:
10/210 + 294/210 = 10 + 294/210 = 304/210 - 304/210 simplified gives 152/105
- So, 1/21 + 42/30 = 152/105
In mixed form: 147/105
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 2/21+42/30 1/21+84/30 1/42+42/30 1/21+42/60 3/21+42/30 1/63+42/30 1/21+42/90 5/21+42/30 7/21+42/30