Answers

Subtract 54/64 from 90/20

1^st number: 4 10/20, 2^nd number: 54/64

90/20 - 54/64 is 117/32.

Steps for subtracting 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,
   90/20 = 90 × 16/20 × 16 = 1440/320
3. Likewise, for the 2nd fraction, since 64 × 5 = 320,
   54/64 = 54 × 5/64 × 5 = 270/320
4. Subtract the two like fractions:
   1440/320 - 270/320 = 1440 - 270/320 = 1170/320
5. After reducing the fraction, the answer is 117/32
6. In mixed form: 321/32

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