Answers

Add 28/63 and 42/90

28/63 + 42/90 is 41/45.

Steps for adding fractions

1. Find the least common denominator or LCM of the two denominators:
   LCM of 63 and 90 is 630
   
   Next, find the equivalent fraction of both fractional numbers with denominator 630
2. For the 1st fraction, since 63 × 10 = 630,
   28/63 = 28 × 10/63 × 10 = 280/630
3. Likewise, for the 2nd fraction, since 90 × 7 = 630,
   42/90 = 42 × 7/90 × 7 = 294/630
4. Add the two like fractions:
   280/630 + 294/630 = 280 + 294/630 = 574/630
5. 574/630 simplified gives 41/45
6. So, 28/63 + 42/90 = 41/45

MathStep (Works offline)

Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad

Related: ⁵⁶/₆₃+⁴²/₉₀ ²⁸/₆₃+⁸⁴/₉₀ ⁸⁴/₆₃+⁴²/₉₀

Add Fractions Calculator