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 9^{th} floor of a building. There are 36 stairs between two connecting floors. How many stairs does Lisa have to climb to reach the 9^{th} 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
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