Add 21/56 and 54/40
1st number: 21/56, 2nd number: 1 14/40
21/56 + 54/40 is 69/40.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 56 and 40 is 280
Next, find the equivalent fraction of both fractional numbers with denominator 280 - For the 1st fraction, since 56 × 5 = 280,
21/56 = 21 × 5/56 × 5 = 105/280 - Likewise, for the 2nd fraction, since 40 × 7 = 280,
54/40 = 54 × 7/40 × 7 = 378/280 - Add the two like fractions:
105/280 + 378/280 = 105 + 378/280 = 483/280 - 483/280 simplified gives 69/40
- So, 21/56 + 54/40 = 69/40
In mixed form: 129/40
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 42/56+54/40 21/56+54/80 63/56+54/40