1. 
558 can be rounded to 600.
44 can be rounded to 40.
600 x 40 = 24,000
2.
9 x 802 = 9 (800 +2) =7200 + 18 = 7218
3.
3699 x 7 = (3700-1) x 7 = 25,900 - 7 = 25,893
4. 
34 x 93 = 34 x (100-7) = 3400 - 238 = 3162
5.
678 x 87 = 58,986
        
             
        
        
        
Answer:
The answer is " is not a perfect square".
 is not a perfect square".
Step-by-step explanation:
12 is not a perfect square because it is the natural number, and no other natural number would square the number 12, that's why it is not a perfect square.
 If we calculate the square root of  . so, it is will give
. so, it is will give  that is not a perfect square root which can be described as follows:
 that is not a perfect square root which can be described as follows:
 
             
 is not a perfect square root.
 is not a perfect square root. 
 
        
                    
             
        
        
        
Answer:
 x=6
Step-by-step explanation:
Hope it was right
 
        
                    
             
        
        
        
Answer:
The answer is 3.
Step-by-step explanation:
I tested out different numbers in the blank spot to see what equals 1092,That's all.