Add 54/21 and 18/45
1st number: 2 12/21, 2nd number: 18/45
54/21 + 18/45 is 104/35.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 21 and 45 is 315
Next, find the equivalent fraction of both fractional numbers with denominator 315 - For the 1st fraction, since 21 × 15 = 315,
54/21 = 54 × 15/21 × 15 = 810/315 - Likewise, for the 2nd fraction, since 45 × 7 = 315,
18/45 = 18 × 7/45 × 7 = 126/315 - Add the two like fractions:
810/315 + 126/315 = 810 + 126/315 = 936/315 - 936/315 simplified gives 104/35
- So, 54/21 + 18/45 = 104/35
In mixed form: 234/35
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 54/21+36/45 54/42+18/45 54/21+18/90 54/21+54/45 54/63+18/45 54/21+90/45