Add 42/12 and 15/40
1st number: 3 6/12, 2nd number: 15/40
42/12 + 15/40 is 31/8.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 12 and 40 is 120
Next, find the equivalent fraction of both fractional numbers with denominator 120 - For the 1st fraction, since 12 × 10 = 120,
42/12 = 42 × 10/12 × 10 = 420/120 - Likewise, for the 2nd fraction, since 40 × 3 = 120,
15/40 = 15 × 3/40 × 3 = 45/120 - Add the two like fractions:
420/120 + 45/120 = 420 + 45/120 = 465/120 - 465/120 simplified gives 31/8
- So, 42/12 + 15/40 = 31/8
In mixed form: 37/8
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 84/12+15/40 42/12+30/40 42/24+15/40 42/12+15/80 42/12+45/40 42/36+15/40 42/12+75/40 42/60+15/40 42/84+15/40