Add 21/20 and 45/12
1st number: 1 1/20, 2nd number: 3 9/12
21/20 + 45/12 is 24/5.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 20 and 12 is 60
Next, find the equivalent fraction of both fractional numbers with denominator 60 - For the 1st fraction, since 20 × 3 = 60,
21/20 = 21 × 3/20 × 3 = 63/60 - Likewise, for the 2nd fraction, since 12 × 5 = 60,
45/12 = 45 × 5/12 × 5 = 225/60 - Add the two like fractions:
63/60 + 225/60 = 63 + 225/60 = 288/60 - 288/60 simplified gives 24/5
- So, 21/20 + 45/12 = 24/5
In mixed form: 44/5
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 42/20+45/12 21/20+90/12 21/40+45/12 21/20+45/24 63/20+45/12 21/60+45/12 21/20+45/36 21/20+45/60 21/20+45/84