2 answers:
            
              
              
                
                
Hey there! :D
Remember that the question said estimate. 
So 
47% rounds to 50% 
.5 and 1/2 are equal to 50% 
89 rounds to 90. 
You could say that:
1/2*90
0.5*90
90/2 
These will all work and will give you the same answer. 
I hope this helps!
~kaikers
                                
             
                    
              
              
                
                
Hi!
To get a good estimate you would round 47% up to 50% and 89 up to 90. Since 50% is half, making one of your answers divide 90 by 2.
You can also round 47% to 50% and make it into a decimal, so .5. This means you can also multiply .5 by 90.
Lastly, you can round 47% to 50%  and make it a fraction, which would be 1/2. Therefore, you can multiple 1/2 by 90 and get the same answer.
Overall, the correct answers should be A, B, and D.
Hope this helps!
                                
             
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