Add 54/21 and 80/20
1st number: 2 12/21, 2nd number: 4 0/20
54/21 + 80/20 is 46/7.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 21 and 20 is 420
Next, find the equivalent fraction of both fractional numbers with denominator 420 - For the 1st fraction, since 21 × 20 = 420,
54/21 = 54 × 20/21 × 20 = 1080/420 - Likewise, for the 2nd fraction, since 20 × 21 = 420,
80/20 = 80 × 21/20 × 21 = 1680/420 - Add the two like fractions:
1080/420 + 1680/420 = 1080 + 1680/420 = 2760/420 - 2760/420 simplified gives 46/7
- So, 54/21 + 80/20 = 46/7
In mixed form: 64/7
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 54/42+80/20 54/21+80/40 54/63+80/20 54/21+80/60