Answers

Add 21/63 and 4/7

21/63 + 4/7 is 19/21.

Steps for adding fractions

1. Find the least common denominator or LCM of the two denominators:
   LCM of 63 and 7 is 63
   
   Next, find the equivalent fraction of both fractional numbers with denominator 63
2. For the 1st fraction, since 63 × 1 = 63,
   21/63 = 21 × 1/63 × 1 = 21/63
3. Likewise, for the 2nd fraction, since 7 × 9 = 63,
   4/7 = 4 × 9/7 × 9 = 36/63
4. Add the two like fractions:
   21/63 + 36/63 = 21 + 36/63 = 57/63
5. 57/63 simplified gives 19/21
6. So, 21/63 + 4/7 = 19/21

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