Add 70/72 and 84/42
1st number: 70/72, 2nd number: 2 0/42
70/72 + 84/42 is 107/36.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 72 and 42 is 504
Next, find the equivalent fraction of both fractional numbers with denominator 504 - For the 1st fraction, since 72 × 7 = 504,
70/72 = 70 × 7/72 × 7 = 490/504 - Likewise, for the 2nd fraction, since 42 × 12 = 504,
84/42 = 84 × 12/42 × 12 = 1008/504 - Add the two like fractions:
490/504 + 1008/504 = 490 + 1008/504 = 1498/504 - 1498/504 simplified gives 107/36
- So, 70/72 + 84/42 = 107/36
In mixed form: 235/36
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: