Add 27/54 and 10/21
27/54 + 10/21 is 41/42.
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,
27/54 = 27 × 7/54 × 7 = 189/378 - Likewise, for the 2nd fraction, since 21 × 18 = 378,
10/21 = 10 × 18/21 × 18 = 180/378 - Add the two like fractions:
189/378 + 180/378 = 189 + 180/378 = 369/378 - 369/378 simplified gives 41/42
- So, 27/54 + 10/21 = 41/42
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 27/54+20/21 27/54+10/42 81/54+10/21 27/54+30/21 27/54+10/63 27/54+50/21 27/54+70/21