Add 21/70 and 9/4
1st number: 21/70, 2nd number: 2 1/4
21/70 + 9/4 is 51/20.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 70 and 4 is 140
Next, find the equivalent fraction of both fractional numbers with denominator 140 - For the 1st fraction, since 70 × 2 = 140,
21/70 = 21 × 2/70 × 2 = 42/140 - Likewise, for the 2nd fraction, since 4 × 35 = 140,
9/4 = 9 × 35/4 × 35 = 315/140 - Add the two like fractions:
42/140 + 315/140 = 42 + 315/140 = 357/140 - 357/140 simplified gives 51/20
- So, 21/70 + 9/4 = 51/20
In mixed form: 211/20
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 42/70+9/4 21/70+18/4 21/70+9/8 63/70+9/4 21/70+27/4 21/70+9/12 21/70+45/4 21/70+9/20 21/70+63/4 21/70+9/28