Add 81/70 and 9/8
1st number: 1 11/70, 2nd number: 1 1/8
81/70 + 9/8 is 639/280.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 70 and 8 is 280
Next, find the equivalent fraction of both fractional numbers with denominator 280 - For the 1st fraction, since 70 × 4 = 280,
81/70 = 81 × 4/70 × 4 = 324/280 - Likewise, for the 2nd fraction, since 8 × 35 = 280,
9/8 = 9 × 35/8 × 35 = 315/280 - Add the two like fractions:
324/280 + 315/280 = 324 + 315/280 = 639/280 - So, 81/70 + 9/8 = 639/280
In mixed form: 279/280
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 81/70+18/8 81/70+9/16 81/70+27/8 81/70+9/24 81/70+45/8 81/70+9/40 81/70+63/8 81/70+9/56