Add 21/20 and 1/7
1st number: 1 1/20, 2nd number: 1/7
21/20 + 1/7 is 167/140.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 20 and 7 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 7 × 20 = 140,
1/7 = 1 × 20/7 × 20 = 20/140 - Add the two like fractions:
147/140 + 20/140 = 147 + 20/140 = 167/140 - So, 21/20 + 1/7 = 167/140
In mixed form: 127/140
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 42/20+1/7 21/20+2/7 21/40+1/7 21/20+1/14 63/20+1/7 21/20+3/7 21/60+1/7 21/20+1/21 21/20+5/7 21/20+1/35 21/20+1/49