Add 12/42 and 9/30
12/42 + 9/30 is 41/70.
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,
12/42 = 12 × 5/42 × 5 = 60/210 - Likewise, for the 2nd fraction, since 30 × 7 = 210,
9/30 = 9 × 7/30 × 7 = 63/210 - Add the two like fractions:
60/210 + 63/210 = 60 + 63/210 = 123/210 - 123/210 simplified gives 41/70
- So, 12/42 + 9/30 = 41/70
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 24/42+9/30 12/42+18/30 12/84+9/30 12/42+9/60 36/42+9/30 12/42+27/30 12/42+9/90 60/42+9/30 12/42+45/30 84/42+9/30 12/42+63/30