Add 18/21 and 4/45
18/21 + 4/45 is 298/315.
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,
18/21 = 18 × 15/21 × 15 = 270/315 - Likewise, for the 2nd fraction, since 45 × 7 = 315,
4/45 = 4 × 7/45 × 7 = 28/315 - Add the two like fractions:
270/315 + 28/315 = 270 + 28/315 = 298/315 - So, 18/21 + 4/45 = 298/315
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 36/21+4/45 18/21+8/45 18/42+4/45 18/21+4/90 54/21+4/45 18/21+12/45 18/63+4/45 90/21+4/45 18/21+20/45 18/21+28/45