Add 60/70 and 30/80
60/70 + 30/80 is 69/56.
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,
30/80 = 30 × 7/80 × 7 = 210/560 - Add the two like fractions:
480/560 + 210/560 = 480 + 210/560 = 690/560 - 690/560 simplified gives 69/56
- So, 60/70 + 30/80 = 69/56
In mixed form: 113/56
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 60/70+60/80 60/70+90/80