Add 9/4 and 21/70
1st number: 2 1/4, 2nd number: 21/70
9/4 + 21/70 is 51/20.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 4 and 70 is 140
Next, find the equivalent fraction of both fractional numbers with denominator 140 - For the 1st fraction, since 4 × 35 = 140,
9/4 = 9 × 35/4 × 35 = 315/140 - Likewise, for the 2nd fraction, since 70 × 2 = 140,
21/70 = 21 × 2/70 × 2 = 42/140 - Add the two like fractions:
315/140 + 42/140 = 315 + 42/140 = 357/140 - 357/140 simplified gives 51/20
- So, 9/4 + 21/70 = 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: 18/4+21/70 9/4+42/70 9/8+21/70 27/4+21/70 9/4+63/70 9/12+21/70 45/4+21/70 9/20+21/70 63/4+21/70 9/28+21/70