Add 42/90 and 18/42
42/90 + 18/42 is 94/105.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 90 and 42 is 630
Next, find the equivalent fraction of both fractional numbers with denominator 630 - For the 1st fraction, since 90 × 7 = 630,
42/90 = 42 × 7/90 × 7 = 294/630 - Likewise, for the 2nd fraction, since 42 × 15 = 630,
18/42 = 18 × 15/42 × 15 = 270/630 - Add the two like fractions:
294/630 + 270/630 = 294 + 270/630 = 564/630 - 564/630 simplified gives 94/105
- So, 42/90 + 18/42 = 94/105
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 84/90+18/42 42/90+36/42 42/90+18/84 42/90+54/42 42/90+90/42