Add 21/36 and 54/42
1st number: 21/36, 2nd number: 1 12/42
21/36 + 54/42 is 157/84.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 36 and 42 is 252
Next, find the equivalent fraction of both fractional numbers with denominator 252 - For the 1st fraction, since 36 × 7 = 252,
21/36 = 21 × 7/36 × 7 = 147/252 - Likewise, for the 2nd fraction, since 42 × 6 = 252,
54/42 = 54 × 6/42 × 6 = 324/252 - Add the two like fractions:
147/252 + 324/252 = 147 + 324/252 = 471/252 - 471/252 simplified gives 157/84
- So, 21/36 + 54/42 = 157/84
In mixed form: 173/84
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 42/36+54/42 21/72+54/42 21/36+54/84 63/36+54/42