Add 18/42 and 10/90
18/42 + 10/90 is 34/63.
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,
10/90 = 10 × 7/90 × 7 = 70/630 - Add the two like fractions:
270/630 + 70/630 = 270 + 70/630 = 340/630 - 340/630 simplified gives 34/63
- So, 18/42 + 10/90 = 34/63
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 36/42+10/90 18/42+20/90 18/84+10/90 54/42+10/90 18/42+30/90 90/42+10/90 18/42+50/90 18/42+70/90