Add 42/40 and 9/12
1st number: 1 2/40, 2nd number: 9/12
42/40 + 9/12 is 9/5.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 40 and 12 is 120
Next, find the equivalent fraction of both fractional numbers with denominator 120 - For the 1st fraction, since 40 × 3 = 120,
42/40 = 42 × 3/40 × 3 = 126/120 - Likewise, for the 2nd fraction, since 12 × 10 = 120,
9/12 = 9 × 10/12 × 10 = 90/120 - Add the two like fractions:
126/120 + 90/120 = 126 + 90/120 = 216/120 - 216/120 simplified gives 9/5
- So, 42/40 + 9/12 = 9/5
In mixed form: 14/5
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 84/40+9/12 42/40+18/12 42/80+9/12 42/40+9/24 42/40+27/12 42/40+9/36 42/40+45/12 42/40+9/60 42/40+63/12 42/40+9/84