Add 45/54 and 81/42
1st number: 45/54, 2nd number: 1 39/42
45/54 + 81/42 is 58/21.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 54 and 42 is 378
Next, find the equivalent fraction of both fractional numbers with denominator 378 - For the 1st fraction, since 54 × 7 = 378,
45/54 = 45 × 7/54 × 7 = 315/378 - Likewise, for the 2nd fraction, since 42 × 9 = 378,
81/42 = 81 × 9/42 × 9 = 729/378 - Add the two like fractions:
315/378 + 729/378 = 315 + 729/378 = 1044/378 - 1044/378 simplified gives 58/21
- So, 45/54 + 81/42 = 58/21
In mixed form: 216/21
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 90/54+81/42 45/54+81/84