Add 8/42 and 45/72
8/42 + 45/72 is 137/168.
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,
8/42 = 8 × 12/42 × 12 = 96/504 - Likewise, for the 2nd fraction, since 72 × 7 = 504,
45/72 = 45 × 7/72 × 7 = 315/504 - Add the two like fractions:
96/504 + 315/504 = 96 + 315/504 = 411/504 - 411/504 simplified gives 137/168
- So, 8/42 + 45/72 = 137/168
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 16/42+45/72 8/42+90/72 8/84+45/72 24/42+45/72 40/42+45/72 56/42+45/72