Add 21/42 and 2/30
21/42 + 2/30 is 17/30.
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,
21/42 = 21 × 5/42 × 5 = 105/210 - Likewise, for the 2nd fraction, since 30 × 7 = 210,
2/30 = 2 × 7/30 × 7 = 14/210 - Add the two like fractions:
105/210 + 14/210 = 105 + 14/210 = 119/210 - 119/210 simplified gives 17/30
- So, 21/42 + 2/30 = 17/30
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 21/42+4/30 21/84+2/30 21/42+2/60 63/42+2/30 21/42+6/30 21/42+2/90 21/42+10/30 21/42+14/30