Add 21/4 and 54/20
1st number: 5 1/4, 2nd number: 2 14/20
21/4 + 54/20 is 159/20.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 4 and 20 is 20
Next, find the equivalent fraction of both fractional numbers with denominator 20 - For the 1st fraction, since 4 × 5 = 20,
21/4 = 21 × 5/4 × 5 = 105/20 - Likewise, for the 2nd fraction, since 20 × 1 = 20,
54/20 = 54 × 1/20 × 1 = 54/20 - Add the two like fractions:
105/20 + 54/20 = 105 + 54/20 = 159/20 - So, 21/4 + 54/20 = 159/20
In mixed form: 719/20
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 42/4+54/20 21/8+54/20 21/4+54/40 63/4+54/20 21/12+54/20 21/4+54/60 21/20+54/20 21/28+54/20