Add 90/70 and 90/75
1st number: 1 20/70, 2nd number: 1 15/75
90/70 + 90/75 is 87/35.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 70 and 75 is 1050
Next, find the equivalent fraction of both fractional numbers with denominator 1050 - For the 1st fraction, since 70 × 15 = 1050,
90/70 = 90 × 15/70 × 15 = 1350/1050 - Likewise, for the 2nd fraction, since 75 × 14 = 1050,
90/75 = 90 × 14/75 × 14 = 1260/1050 - Add the two like fractions:
1350/1050 + 1260/1050 = 1350 + 1260/1050 = 2610/1050 - 2610/1050 simplified gives 87/35
- So, 90/70 + 90/75 = 87/35
In mixed form: 217/35
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: