Add 5/42 and 45/54
5/42 + 45/54 is 20/21.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 42 and 54 is 378
Next, find the equivalent fraction of both fractional numbers with denominator 378 - For the 1st fraction, since 42 × 9 = 378,
5/42 = 5 × 9/42 × 9 = 45/378 - Likewise, for the 2nd fraction, since 54 × 7 = 378,
45/54 = 45 × 7/54 × 7 = 315/378 - Add the two like fractions:
45/378 + 315/378 = 45 + 315/378 = 360/378 - 360/378 simplified gives 20/21
- So, 5/42 + 45/54 = 20/21
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 10/42+45/54 5/42+90/54 5/84+45/54 15/42+45/54 25/42+45/54 35/42+45/54