4/9 times 81 i just cant figure it out

4/9 × 81/1 ( the fraction still equals 81)

Now cross cancel;

4/1 × 9/1 

multiply numerators;

4 × 9 = 36

multiply denominators;

1 ×1 = 1

so 4/9 × 81 =  36/1 or in simplest form = 36

i believe the answer is c.

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