Add 42/15 and 18/40
1st number: 2 12/15, 2nd number: 18/40
42/15 + 18/40 is 13/4.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 15 and 40 is 120
Next, find the equivalent fraction of both fractional numbers with denominator 120 - For the 1st fraction, since 15 × 8 = 120,
42/15 = 42 × 8/15 × 8 = 336/120 - Likewise, for the 2nd fraction, since 40 × 3 = 120,
18/40 = 18 × 3/40 × 3 = 54/120 - Add the two like fractions:
336/120 + 54/120 = 336 + 54/120 = 390/120 - 390/120 simplified gives 13/4
- So, 42/15 + 18/40 = 13/4
In mixed form: 31/4
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 84/15+18/40 42/15+36/40 42/30+18/40 42/15+18/80 42/15+54/40 42/45+18/40 42/15+90/40 42/75+18/40