Add 28/90 and 21/35
28/90 + 21/35 is 41/45.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 90 and 35 is 630
Next, find the equivalent fraction of both fractional numbers with denominator 630 - For the 1st fraction, since 90 × 7 = 630,
28/90 = 28 × 7/90 × 7 = 196/630 - Likewise, for the 2nd fraction, since 35 × 18 = 630,
21/35 = 21 × 18/35 × 18 = 378/630 - Add the two like fractions:
196/630 + 378/630 = 196 + 378/630 = 574/630 - 574/630 simplified gives 41/45
- So, 28/90 + 21/35 = 41/45
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 56/90+21/35 28/90+42/35 28/90+21/70 84/90+21/35 28/90+63/35