Add 54/21 and 20/8
1st number: 2 12/21, 2nd number: 2 4/8
54/21 + 20/8 is 71/14.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 21 and 8 is 168
Next, find the equivalent fraction of both fractional numbers with denominator 168 - For the 1st fraction, since 21 × 8 = 168,
54/21 = 54 × 8/21 × 8 = 432/168 - Likewise, for the 2nd fraction, since 8 × 21 = 168,
20/8 = 20 × 21/8 × 21 = 420/168 - Add the two like fractions:
432/168 + 420/168 = 432 + 420/168 = 852/168 - 852/168 simplified gives 71/14
- So, 54/21 + 20/8 = 71/14
In mixed form: 51/14
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 54/21+40/8 54/42+20/8 54/21+20/16 54/21+60/8 54/63+20/8 54/21+20/24 54/21+20/40 54/21+20/56