Add 20/42 and 70/9
1st number: 20/42, 2nd number: 7 7/9
20/42 + 70/9 is 520/63.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 42 and 9 is 126
Next, find the equivalent fraction of both fractional numbers with denominator 126 - For the 1st fraction, since 42 × 3 = 126,
20/42 = 20 × 3/42 × 3 = 60/126 - Likewise, for the 2nd fraction, since 9 × 14 = 126,
70/9 = 70 × 14/9 × 14 = 980/126 - Add the two like fractions:
60/126 + 980/126 = 60 + 980/126 = 1040/126 - 1040/126 simplified gives 520/63
- So, 20/42 + 70/9 = 520/63
In mixed form: 816/63
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 40/42+70/9 20/84+70/9 20/42+70/18 60/42+70/9 20/42+70/27 20/42+70/45 20/42+70/63