Add 40/63 and 21/54
40/63 + 21/54 is 43/42.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 63 and 54 is 378
Next, find the equivalent fraction of both fractional numbers with denominator 378 - For the 1st fraction, since 63 × 6 = 378,
40/63 = 40 × 6/63 × 6 = 240/378 - Likewise, for the 2nd fraction, since 54 × 7 = 378,
21/54 = 21 × 7/54 × 7 = 147/378 - Add the two like fractions:
240/378 + 147/378 = 240 + 147/378 = 387/378 - 387/378 simplified gives 43/42
- So, 40/63 + 21/54 = 43/42
In mixed form: 11/42
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 80/63+21/54 40/63+42/54 40/63+63/54