Add 28/7 and 20/90
1st number: 4 0/7, 2nd number: 20/90
28/7 + 20/90 is 38/9.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 7 and 90 is 630
Next, find the equivalent fraction of both fractional numbers with denominator 630 - For the 1st fraction, since 7 × 90 = 630,
28/7 = 28 × 90/7 × 90 = 2520/630 - Likewise, for the 2nd fraction, since 90 × 7 = 630,
20/90 = 20 × 7/90 × 7 = 140/630 - Add the two like fractions:
2520/630 + 140/630 = 2520 + 140/630 = 2660/630 - 2660/630 simplified gives 38/9
- So, 28/7 + 20/90 = 38/9
In mixed form: 42/9
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 56/7+20/90 28/7+40/90 28/14+20/90 84/7+20/90 28/7+60/90 28/21+20/90 28/35+20/90 28/49+20/90