Add 12/42 and 56/80
12/42 + 56/80 is 69/70.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 42 and 80 is 1680
Next, find the equivalent fraction of both fractional numbers with denominator 1680 - For the 1st fraction, since 42 × 40 = 1680,
12/42 = 12 × 40/42 × 40 = 480/1680 - Likewise, for the 2nd fraction, since 80 × 21 = 1680,
56/80 = 56 × 21/80 × 21 = 1176/1680 - Add the two like fractions:
480/1680 + 1176/1680 = 480 + 1176/1680 = 1656/1680 - 1656/1680 simplified gives 69/70
- So, 12/42 + 56/80 = 69/70
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 24/42+56/80 12/84+56/80 36/42+56/80 60/42+56/80 84/42+56/80