Add 20/7 and 42/9
1st number: 2 6/7, 2nd number: 4 6/9
20/7 + 42/9 is 158/21.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 7 and 9 is 63
Next, find the equivalent fraction of both fractional numbers with denominator 63 - For the 1st fraction, since 7 × 9 = 63,
20/7 = 20 × 9/7 × 9 = 180/63 - Likewise, for the 2nd fraction, since 9 × 7 = 63,
42/9 = 42 × 7/9 × 7 = 294/63 - Add the two like fractions:
180/63 + 294/63 = 180 + 294/63 = 474/63 - 474/63 simplified gives 158/21
- So, 20/7 + 42/9 = 158/21
In mixed form: 711/21
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 40/7+42/9 20/7+84/9 20/14+42/9 20/7+42/18 60/7+42/9 20/21+42/9 20/7+42/27 20/35+42/9 20/7+42/45 20/49+42/9 20/7+42/63