Answers

Add 21/63 and 8/90

21/63 + 8/90 is 19/45.

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,
   21/63 = 21 × 10/63 × 10 = 210/630
3. Likewise, for the 2nd fraction, since 90 × 7 = 630,
   8/90 = 8 × 7/90 × 7 = 56/630
4. Add the two like fractions:
   210/630 + 56/630 = 210 + 56/630 = 266/630
5. 266/630 simplified gives 19/45
6. So, 21/63 + 8/90 = 19/45

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