Add 21/18 and 45/56
1st number: 1 3/18, 2nd number: 45/56
21/18 + 45/56 is 331/168.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 18 and 56 is 504
Next, find the equivalent fraction of both fractional numbers with denominator 504 - For the 1st fraction, since 18 × 28 = 504,
21/18 = 21 × 28/18 × 28 = 588/504 - Likewise, for the 2nd fraction, since 56 × 9 = 504,
45/56 = 45 × 9/56 × 9 = 405/504 - Add the two like fractions:
588/504 + 405/504 = 588 + 405/504 = 993/504 - 993/504 simplified gives 331/168
- So, 21/18 + 45/56 = 331/168
In mixed form: 1163/168
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 42/18+45/56 21/18+90/56 21/36+45/56 63/18+45/56 21/54+45/56 21/90+45/56