Add 42/56 and 81/30
1st number: 42/56, 2nd number: 2 21/30
42/56 + 81/30 is 69/20.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 56 and 30 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 30 × 28 = 840,
81/30 = 81 × 28/30 × 28 = 2268/840 - Add the two like fractions:
630/840 + 2268/840 = 630 + 2268/840 = 2898/840 - 2898/840 simplified gives 69/20
- So, 42/56 + 81/30 = 69/20
In mixed form: 39/20
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 84/56+81/30 42/56+81/60 42/56+81/90