Add 45/20 and 21/4
1st number: 2 5/20, 2nd number: 5 1/4
45/20 + 21/4 is 15/2.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 20 and 4 is 20
Next, find the equivalent fraction of both fractional numbers with denominator 20 - For the 1st fraction, since 20 × 1 = 20,
45/20 = 45 × 1/20 × 1 = 45/20 - Likewise, for the 2nd fraction, since 4 × 5 = 20,
21/4 = 21 × 5/4 × 5 = 105/20 - Add the two like fractions:
45/20 + 105/20 = 45 + 105/20 = 150/20 - 150/20 simplified gives 15/2
- So, 45/20 + 21/4 = 15/2
In mixed form: 71/2
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 90/20+21/4 45/20+42/4 45/40+21/4 45/20+21/8 45/20+63/4 45/60+21/4 45/20+21/12 45/20+21/20 45/20+21/28