Add 12/72 and 9/70
12/72 + 9/70 is 31/105.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 72 and 70 is 2520
Next, find the equivalent fraction of both fractional numbers with denominator 2520 - For the 1st fraction, since 72 × 35 = 2520,
12/72 = 12 × 35/72 × 35 = 420/2520 - Likewise, for the 2nd fraction, since 70 × 36 = 2520,
9/70 = 9 × 36/70 × 36 = 324/2520 - Add the two like fractions:
420/2520 + 324/2520 = 420 + 324/2520 = 744/2520 - 744/2520 simplified gives 31/105
- So, 12/72 + 9/70 = 31/105
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 24/72+9/70 12/72+18/70 36/72+9/70 12/72+27/70 60/72+9/70 12/72+45/70 84/72+9/70 12/72+63/70