Answer:
<h3>

 = -1   </h3><h3>

*

 = 1.4142</h3><h3>

  = π =3.14159</h3><h3>

 = π² = 9.8696</h3>
Explanation:
1.) Rewrite √24 =  Rewrite √54 =
   Rewrite √54 =
Divide both terms by the denominator; √6 cancels. 2-3 = -1
2.) Rewrite as  ×
 × The 3's cancel.  10/2 = 5√2 in the numerator.
  The 3's cancel.  10/2 = 5√2 in the numerator.
√5 × √5 = 5 in the denominator.  The 5's cancel. 
That leaves √2 ≈1.4142
3.) Divide the terms in the numerator by the term in the denominator. 
√2's cancel.  10π/2 = 5π   8π/2 = 4π  
Subtract and we are left with π = 3.14159
4.)  The square roots are reciprocals. They multiply to 1
  The square roots are reciprocals. They multiply to 1
 We are left with π × π = π² ≈  9.8696
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