Add 12/8 and 9/42
1st number: 1 4/8, 2nd number: 9/42
12/8 + 9/42 is 12/7.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 8 and 42 is 168
Next, find the equivalent fraction of both fractional numbers with denominator 168 - For the 1st fraction, since 8 × 21 = 168,
12/8 = 12 × 21/8 × 21 = 252/168 - Likewise, for the 2nd fraction, since 42 × 4 = 168,
9/42 = 9 × 4/42 × 4 = 36/168 - Add the two like fractions:
252/168 + 36/168 = 252 + 36/168 = 288/168 - 288/168 simplified gives 12/7
- So, 12/8 + 9/42 = 12/7
In mixed form: 15/7
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 24/8+9/42 12/8+18/42 12/16+9/42 12/8+9/84 36/8+9/42 12/8+27/42 12/24+9/42 60/8+9/42 12/8+45/42 12/40+9/42 84/8+9/42 12/8+63/42 12/56+9/42