Add 27/42 and 70/80
27/42 + 70/80 is 85/56.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 42 and 80 is 1680
Next, find the equivalent fraction of both fractional numbers with denominator 1680 - For the 1st fraction, since 42 × 40 = 1680,
27/42 = 27 × 40/42 × 40 = 1080/1680 - Likewise, for the 2nd fraction, since 80 × 21 = 1680,
70/80 = 70 × 21/80 × 21 = 1470/1680 - Add the two like fractions:
1080/1680 + 1470/1680 = 1080 + 1470/1680 = 2550/1680 - 2550/1680 simplified gives 85/56
- So, 27/42 + 70/80 = 85/56
In mixed form: 129/56
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 54/42+70/80 27/84+70/80 81/42+70/80