Add 28/80 and 90/70
1st number: 28/80, 2nd number: 1 20/70
28/80 + 90/70 is 229/140.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 80 and 70 is 560
Next, find the equivalent fraction of both fractional numbers with denominator 560 - For the 1st fraction, since 80 × 7 = 560,
28/80 = 28 × 7/80 × 7 = 196/560 - Likewise, for the 2nd fraction, since 70 × 8 = 560,
90/70 = 90 × 8/70 × 8 = 720/560 - Add the two like fractions:
196/560 + 720/560 = 196 + 720/560 = 916/560 - 916/560 simplified gives 229/140
- So, 28/80 + 90/70 = 229/140
In mixed form: 189/140
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 56/80+90/70 84/80+90/70