Add 90/70 and 90/80
1st number: 1 20/70, 2nd number: 1 10/80
90/70 + 90/80 is 135/56.
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,
90/70 = 90 × 8/70 × 8 = 720/560 - Likewise, for the 2nd fraction, since 80 × 7 = 560,
90/80 = 90 × 7/80 × 7 = 630/560 - Add the two like fractions:
720/560 + 630/560 = 720 + 630/560 = 1350/560 - 1350/560 simplified gives 135/56
- So, 90/70 + 90/80 = 135/56
In mixed form: 223/56
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: