Add 84/42 and 81/72
1st number: 2 0/42, 2nd number: 1 9/72
84/42 + 81/72 is 25/8.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 42 and 72 is 504
Next, find the equivalent fraction of both fractional numbers with denominator 504 - For the 1st fraction, since 42 × 12 = 504,
84/42 = 84 × 12/42 × 12 = 1008/504 - Likewise, for the 2nd fraction, since 72 × 7 = 504,
81/72 = 81 × 7/72 × 7 = 567/504 - Add the two like fractions:
1008/504 + 567/504 = 1008 + 567/504 = 1575/504 - 1575/504 simplified gives 25/8
- So, 84/42 + 81/72 = 25/8
In mixed form: 31/8
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: