Add 5/42 and 15/90
5/42 + 15/90 is 2/7.
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,
5/42 = 5 × 15/42 × 15 = 75/630 - Likewise, for the 2nd fraction, since 90 × 7 = 630,
15/90 = 15 × 7/90 × 7 = 105/630 - Add the two like fractions:
75/630 + 105/630 = 75 + 105/630 = 180/630 - 180/630 simplified gives 2/7
- So, 5/42 + 15/90 = 2/7
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 10/42+15/90 5/42+30/90 5/84+15/90 15/42+15/90 5/42+45/90 25/42+15/90 5/42+75/90 35/42+15/90