Add 21/54 and 7/45
21/54 + 7/45 is 49/90.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 54 and 45 is 270
Next, find the equivalent fraction of both fractional numbers with denominator 270 - For the 1st fraction, since 54 × 5 = 270,
21/54 = 21 × 5/54 × 5 = 105/270 - Likewise, for the 2nd fraction, since 45 × 6 = 270,
7/45 = 7 × 6/45 × 6 = 42/270 - Add the two like fractions:
105/270 + 42/270 = 105 + 42/270 = 147/270 - 147/270 simplified gives 49/90
- So, 21/54 + 7/45 = 49/90
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 42/54+7/45 21/54+14/45 21/54+7/90 63/54+7/45 21/54+21/45 21/54+35/45 21/54+49/45