Add 45/12 and 21/80
1st number: 3 9/12, 2nd number: 21/80
45/12 + 21/80 is 321/80.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 12 and 80 is 240
Next, find the equivalent fraction of both fractional numbers with denominator 240 - For the 1st fraction, since 12 × 20 = 240,
45/12 = 45 × 20/12 × 20 = 900/240 - Likewise, for the 2nd fraction, since 80 × 3 = 240,
21/80 = 21 × 3/80 × 3 = 63/240 - Add the two like fractions:
900/240 + 63/240 = 900 + 63/240 = 963/240 - 963/240 simplified gives 321/80
- So, 45/12 + 21/80 = 321/80
In mixed form: 41/80
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 90/12+21/80 45/12+42/80 45/24+21/80 45/12+63/80 45/36+21/80 45/60+21/80 45/84+21/80