Add 90/7 and 20/72
1st number: 12 6/7, 2nd number: 20/72
90/7 + 20/72 is 1655/126.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 7 and 72 is 504
Next, find the equivalent fraction of both fractional numbers with denominator 504 - For the 1st fraction, since 7 × 72 = 504,
90/7 = 90 × 72/7 × 72 = 6480/504 - Likewise, for the 2nd fraction, since 72 × 7 = 504,
20/72 = 20 × 7/72 × 7 = 140/504 - Add the two like fractions:
6480/504 + 140/504 = 6480 + 140/504 = 6620/504 - 6620/504 simplified gives 1655/126
- So, 90/7 + 20/72 = 1655/126
In mixed form: 1317/126
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 90/7+40/72 90/14+20/72 90/7+60/72 90/21+20/72 90/35+20/72 90/49+20/72