Add 21/35 and 18/90
21/35 + 18/90 is 4/5.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 35 and 90 is 630
Next, find the equivalent fraction of both fractional numbers with denominator 630 - For the 1st fraction, since 35 × 18 = 630,
21/35 = 21 × 18/35 × 18 = 378/630 - Likewise, for the 2nd fraction, since 90 × 7 = 630,
18/90 = 18 × 7/90 × 7 = 126/630 - Add the two like fractions:
378/630 + 126/630 = 378 + 126/630 = 504/630 - 504/630 simplified gives 4/5
- So, 21/35 + 18/90 = 4/5
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 42/35+18/90 21/35+36/90 21/70+18/90 63/35+18/90 21/35+54/90