Add 30/54 and 8/21
30/54 + 8/21 is 59/63.
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,
30/54 = 30 × 7/54 × 7 = 210/378 - Likewise, for the 2nd fraction, since 21 × 18 = 378,
8/21 = 8 × 18/21 × 18 = 144/378 - Add the two like fractions:
210/378 + 144/378 = 210 + 144/378 = 354/378 - 354/378 simplified gives 59/63
- So, 30/54 + 8/21 = 59/63
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 60/54+8/21 30/54+16/21 30/54+8/42 90/54+8/21 30/54+24/21 30/54+8/63 30/54+40/21 30/54+56/21