Add 9/70 and 21/20
1st number: 9/70, 2nd number: 1 1/20
9/70 + 21/20 is 33/28.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 70 and 20 is 140
Next, find the equivalent fraction of both fractional numbers with denominator 140 - For the 1st fraction, since 70 × 2 = 140,
9/70 = 9 × 2/70 × 2 = 18/140 - Likewise, for the 2nd fraction, since 20 × 7 = 140,
21/20 = 21 × 7/20 × 7 = 147/140 - Add the two like fractions:
18/140 + 147/140 = 18 + 147/140 = 165/140 - 165/140 simplified gives 33/28
- So, 9/70 + 21/20 = 33/28
In mixed form: 15/28
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 18/70+21/20 9/70+42/20 9/70+21/40 27/70+21/20 9/70+63/20 9/70+21/60 45/70+21/20 63/70+21/20