Answers

Add 10/20 and 90/64

1^st number: 10/20, 2^nd number: 1 26/64

10/20 + 90/64 is 61/32.

Steps for adding fractions

1. Find the least common denominator or LCM of the two denominators:
   LCM of 20 and 64 is 320
   
   Next, find the equivalent fraction of both fractional numbers with denominator 320
2. For the 1st fraction, since 20 × 16 = 320,
   10/20 = 10 × 16/20 × 16 = 160/320
3. Likewise, for the 2nd fraction, since 64 × 5 = 320,
   90/64 = 90 × 5/64 × 5 = 450/320
4. Add the two like fractions:
   160/320 + 450/320 = 160 + 450/320 = 610/320
5. 610/320 simplified gives 61/32
6. So, 10/20 + 90/64 = 61/32
   In mixed form: 129/32

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