Add 21/20 and 21/70
1st number: 1 1/20, 2nd number: 21/70
21/20 + 21/70 is 27/20.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 20 and 70 is 140
Next, find the equivalent fraction of both fractional numbers with denominator 140 - For the 1st fraction, since 20 × 7 = 140,
21/20 = 21 × 7/20 × 7 = 147/140 - Likewise, for the 2nd fraction, since 70 × 2 = 140,
21/70 = 21 × 2/70 × 2 = 42/140 - Add the two like fractions:
147/140 + 42/140 = 147 + 42/140 = 189/140 - 189/140 simplified gives 27/20
- So, 21/20 + 21/70 = 27/20
In mixed form: 17/20
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 42/20+21/70 21/20+42/70 21/40+21/70 63/20+21/70 21/20+63/70 21/60+21/70