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Fifth Grade Challenging Math

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5-1)   The following is an square array of 16 dots with 4 rows and 4 columns. The red dots are on the outside of the array. If you use 144 dots to form a square array,
(a) how many rows and columns are there?
(b) how many dots are on the outside of the array?

                                 
                              

                   

 

 

5-2)  Lisa lives on the 9th floor of a building. There are 36 stairs between two connecting floors. How many stairs does Lisa have to climb to reach the 9th floor, starting from the first floor?

                                                                  

 

5-3)  Color all the rectangles so that no adjacent rectangles have the same color. What is the minimum number of colors you need?


                            

 

 

 

5-4)  Color all the shapes so that no adjacent shapes have the same color. What is the minimum number of colors you need?

                             

 

5-5)  Find the sequence and fill in the blanks

    a)   45, 30, 18, 9, __, 0
    b)   2, 5, 11, 23, 47, __, __

 

 

 

More challenging math problems for fifth grade: 
1-5  6-10  11-15  16-20  21-25  26-30  31-35  36-40  41-45  46-50  51-60 61-70

 

 

 
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