Add 21/45 and 28/54
21/45 + 28/54 is 133/135.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 45 and 54 is 270
Next, find the equivalent fraction of both fractional numbers with denominator 270 - For the 1st fraction, since 45 × 6 = 270,
21/45 = 21 × 6/45 × 6 = 126/270 - Likewise, for the 2nd fraction, since 54 × 5 = 270,
28/54 = 28 × 5/54 × 5 = 140/270 - Add the two like fractions:
126/270 + 140/270 = 126 + 140/270 = 266/270 - 266/270 simplified gives 133/135
- So, 21/45 + 28/54 = 133/135
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 42/45+28/54 21/45+56/54 21/90+28/54 63/45+28/54 21/45+84/54