Add 21/20 and 45/7
1st number: 1 1/20, 2nd number: 6 3/7
21/20 + 45/7 is 1047/140.
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,
45/7 = 45 × 20/7 × 20 = 900/140 - Add the two like fractions:
147/140 + 900/140 = 147 + 900/140 = 1047/140 - So, 21/20 + 45/7 = 1047/140
In mixed form: 767/140
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 42/20+45/7 21/20+90/7 21/40+45/7 21/20+45/14 63/20+45/7 21/60+45/7 21/20+45/21 21/20+45/35 21/20+45/49