Add 54/21 and 40/18
1st number: 2 12/21, 2nd number: 2 4/18
54/21 + 40/18 is 302/63.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 21 and 18 is 126
Next, find the equivalent fraction of both fractional numbers with denominator 126 - For the 1st fraction, since 21 × 6 = 126,
54/21 = 54 × 6/21 × 6 = 324/126 - Likewise, for the 2nd fraction, since 18 × 7 = 126,
40/18 = 40 × 7/18 × 7 = 280/126 - Add the two like fractions:
324/126 + 280/126 = 324 + 280/126 = 604/126 - 604/126 simplified gives 302/63
- So, 54/21 + 40/18 = 302/63
In mixed form: 450/63
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 54/21+80/18 54/42+40/18 54/21+40/36 54/63+40/18 54/21+40/54 54/21+40/90