Answers

Add 21/64 and 4/20

21/64 + 4/20 is 169/320.

Steps for adding fractions

1. Find the least common denominator or LCM of the two denominators:
   LCM of 64 and 20 is 320
   
   Next, find the equivalent fraction of both fractional numbers with denominator 320
2. For the 1st fraction, since 64 × 5 = 320,
   21/64 = 21 × 5/64 × 5 = 105/320
3. Likewise, for the 2nd fraction, since 20 × 16 = 320,
   4/20 = 4 × 16/20 × 16 = 64/320
4. Add the two like fractions:
   105/320 + 64/320 = 105 + 64/320 = 169/320
5. So, 21/64 + 4/20 = 169/320

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