Add 42/56 and 20/30
42/56 + 20/30 is 17/12.
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,
20/30 = 20 × 28/30 × 28 = 560/840 - Add the two like fractions:
630/840 + 560/840 = 630 + 560/840 = 1190/840 - 1190/840 simplified gives 17/12
- So, 42/56 + 20/30 = 17/12
In mixed form: 15/12
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 84/56+20/30 42/56+40/30 42/56+20/60 42/56+60/30 42/56+20/90