Add 21/70 and 6/8
21/70 + 6/8 is 21/20.
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,
21/70 = 21 × 4/70 × 4 = 84/280 - Likewise, for the 2nd fraction, since 8 × 35 = 280,
6/8 = 6 × 35/8 × 35 = 210/280 - Add the two like fractions:
84/280 + 210/280 = 84 + 210/280 = 294/280 - 294/280 simplified gives 21/20
- So, 21/70 + 6/8 = 21/20
In mixed form: 11/20
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 42/70+6/8 21/70+12/8 21/70+6/16 63/70+6/8 21/70+18/8 21/70+6/24 21/70+30/8 21/70+6/40 21/70+42/8 21/70+6/56