Add 30/35 and 72/80
30/35 + 72/80 is 123/70.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 35 and 80 is 560
Next, find the equivalent fraction of both fractional numbers with denominator 560 - For the 1st fraction, since 35 × 16 = 560,
30/35 = 30 × 16/35 × 16 = 480/560 - Likewise, for the 2nd fraction, since 80 × 7 = 560,
72/80 = 72 × 7/80 × 7 = 504/560 - Add the two like fractions:
480/560 + 504/560 = 480 + 504/560 = 984/560 - 984/560 simplified gives 123/70
- So, 30/35 + 72/80 = 123/70
In mixed form: 153/70
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 60/35+72/80 30/70+72/80 90/35+72/80