Add 90/8 and 21/70
1st number: 11 2/8, 2nd number: 21/70
90/8 + 21/70 is 231/20.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 8 and 70 is 280
Next, find the equivalent fraction of both fractional numbers with denominator 280 - For the 1st fraction, since 8 × 35 = 280,
90/8 = 90 × 35/8 × 35 = 3150/280 - Likewise, for the 2nd fraction, since 70 × 4 = 280,
21/70 = 21 × 4/70 × 4 = 84/280 - Add the two like fractions:
3150/280 + 84/280 = 3150 + 84/280 = 3234/280 - 3234/280 simplified gives 231/20
- So, 90/8 + 21/70 = 231/20
In mixed form: 1111/20
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 90/8+42/70 90/16+21/70 90/8+63/70 90/24+21/70 90/40+21/70 90/56+21/70