Add 45/15 and 21/20
1st number: 3 0/15, 2nd number: 1 1/20
45/15 + 21/20 is 81/20.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 15 and 20 is 60
Next, find the equivalent fraction of both fractional numbers with denominator 60 - For the 1st fraction, since 15 × 4 = 60,
45/15 = 45 × 4/15 × 4 = 180/60 - Likewise, for the 2nd fraction, since 20 × 3 = 60,
21/20 = 21 × 3/20 × 3 = 63/60 - Add the two like fractions:
180/60 + 63/60 = 180 + 63/60 = 243/60 - 243/60 simplified gives 81/20
- So, 45/15 + 21/20 = 81/20
In mixed form: 41/20
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 90/15+21/20 45/15+42/20 45/30+21/20 45/15+21/40 45/15+63/20 45/15+21/60 45/75+21/20