Add 60/70 and 28/80
60/70 + 28/80 is 169/140.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 70 and 80 is 560
Next, find the equivalent fraction of both fractional numbers with denominator 560 - For the 1st fraction, since 70 × 8 = 560,
60/70 = 60 × 8/70 × 8 = 480/560 - Likewise, for the 2nd fraction, since 80 × 7 = 560,
28/80 = 28 × 7/80 × 7 = 196/560 - Add the two like fractions:
480/560 + 196/560 = 480 + 196/560 = 676/560 - 676/560 simplified gives 169/140
- So, 60/70 + 28/80 = 169/140
In mixed form: 129/140
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 60/70+56/80 60/70+84/80