Add 30/70 and 21/8
1st number: 30/70, 2nd number: 2 5/8
30/70 + 21/8 is 171/56.
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,
30/70 = 30 × 4/70 × 4 = 120/280 - Likewise, for the 2nd fraction, since 8 × 35 = 280,
21/8 = 21 × 35/8 × 35 = 735/280 - Add the two like fractions:
120/280 + 735/280 = 120 + 735/280 = 855/280 - 855/280 simplified gives 171/56
- So, 30/70 + 21/8 = 171/56
In mixed form: 33/56
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 60/70+21/8 30/70+42/8 30/70+21/16 90/70+21/8 30/70+63/8 30/70+21/24 30/70+21/40 30/70+21/56