Add 42/40 and 15/3
1st number: 1 2/40, 2nd number: 5 0/3
42/40 + 15/3 is 121/20.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 40 and 3 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 3 × 40 = 120,
15/3 = 15 × 40/3 × 40 = 600/120 - Add the two like fractions:
126/120 + 600/120 = 126 + 600/120 = 726/120 - 726/120 simplified gives 121/20
- So, 42/40 + 15/3 = 121/20
In mixed form: 61/20
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 84/40+15/3 42/40+30/3 42/80+15/3 42/40+15/6 42/40+45/3 42/40+15/9 42/40+75/3 42/40+15/21