Add 20/90 and 72/7
1st number: 20/90, 2nd number: 10 2/7
20/90 + 72/7 is 662/63.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 90 and 7 is 630
Next, find the equivalent fraction of both fractional numbers with denominator 630 - For the 1st fraction, since 90 × 7 = 630,
20/90 = 20 × 7/90 × 7 = 140/630 - Likewise, for the 2nd fraction, since 7 × 90 = 630,
72/7 = 72 × 90/7 × 90 = 6480/630 - Add the two like fractions:
140/630 + 6480/630 = 140 + 6480/630 = 6620/630 - 6620/630 simplified gives 662/63
- So, 20/90 + 72/7 = 662/63
In mixed form: 1032/63
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 40/90+72/7 20/90+72/14 60/90+72/7 20/90+72/21 20/90+72/35 20/90+72/49