Which is the best estimate for the product of 103.132 × 1,031.2?

A.
1,000,000

B.
100,000

C.
10,000

D.
1,000

Question

Which is the best estimate for the product of 103.132 × 1,031.2?
  
 
 

 

 
  

  A. 
  1,000,000   
   

 

 
  

  B. 
  100,000   
   

 

 
  

  C. 
  10,000   
   

 

 
  

  D. 
  1,000

skullpatrol · Answer

Any ideas?
:-)

anonymous · Answer

its between B  D

skullpatrol · Answer

Why?

mathmale · Answer

@countsrnc :  Kindly explain your reasoning.  Do not give out direct answers, even if you're only narrowing down the choices to two from four.

mathmale · Answer

Better yet, involve @countsrnc in finding his or her own estimate.

skullpatrol · Answer

Hint: 

what does 100 X 1, 000 = ?

anonymous · Answer

100000  = to B 10000

mathmale · Answer

What have you learned from doing this?  What will you do next time you see a problem like this one?

mathmale · Answer

What value does skullpatrol's suggestion have here?  (It's a good one.)

anonymous · Answer

count the 0s after decimal point and drop one for the answer

skullpatrol · Answer

$$\huge 100 = 10^2$$

$$\huge 1,000 =10^3$$

$$\huge 100, 000 = 10^{2+3} = 10^5$$