Add 18/42 and 4/90
18/42 + 4/90 is 149/315.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 42 and 90 is 630
Next, find the equivalent fraction of both fractional numbers with denominator 630 - For the 1st fraction, since 42 × 15 = 630,
18/42 = 18 × 15/42 × 15 = 270/630 - Likewise, for the 2nd fraction, since 90 × 7 = 630,
4/90 = 4 × 7/90 × 7 = 28/630 - Add the two like fractions:
270/630 + 28/630 = 270 + 28/630 = 298/630 - 298/630 simplified gives 149/315
- So, 18/42 + 4/90 = 149/315
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 36/42+4/90 18/42+8/90 18/84+4/90 54/42+4/90 18/42+12/90 90/42+4/90 18/42+20/90 18/42+28/90