Add 45/72 and 12/42
45/72 + 12/42 is 51/56.
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,
45/72 = 45 × 7/72 × 7 = 315/504 - Likewise, for the 2nd fraction, since 42 × 12 = 504,
12/42 = 12 × 12/42 × 12 = 144/504 - Add the two like fractions:
315/504 + 144/504 = 315 + 144/504 = 459/504 - 459/504 simplified gives 51/56
- So, 45/72 + 12/42 = 51/56
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 90/72+12/42 45/72+24/42 45/72+12/84 45/72+36/42 45/72+60/42 45/72+84/42