Add 3/54 and 20/21
3/54 + 20/21 is 127/126.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 54 and 21 is 378
Next, find the equivalent fraction of both fractional numbers with denominator 378 - For the 1st fraction, since 54 × 7 = 378,
3/54 = 3 × 7/54 × 7 = 21/378 - Likewise, for the 2nd fraction, since 21 × 18 = 378,
20/21 = 20 × 18/21 × 18 = 360/378 - Add the two like fractions:
21/378 + 360/378 = 21 + 360/378 = 381/378 - 381/378 simplified gives 127/126
- So, 3/54 + 20/21 = 127/126
In mixed form: 11/126
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 6/54+20/21 3/54+40/21 3/54+20/42 9/54+20/21 3/54+60/21 3/54+20/63 15/54+20/21 21/54+20/21