Add 42/56 and 45/15
1st number: 42/56, 2nd number: 3 0/15
42/56 + 45/15 is 15/4.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 56 and 15 is 840
Next, find the equivalent fraction of both fractional numbers with denominator 840 - For the 1st fraction, since 56 × 15 = 840,
42/56 = 42 × 15/56 × 15 = 630/840 - Likewise, for the 2nd fraction, since 15 × 56 = 840,
45/15 = 45 × 56/15 × 56 = 2520/840 - Add the two like fractions:
630/840 + 2520/840 = 630 + 2520/840 = 3150/840 - 3150/840 simplified gives 15/4
- So, 42/56 + 45/15 = 15/4
In mixed form: 33/4
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 84/56+45/15 42/56+90/15 42/56+45/30 42/56+45/75