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The 5*5 grid shown contains a collection of squares with sizes from 1*1 to 5*5. How many of these squares contain the black square?

 

 May 1, 2022
 #1
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Let's count by case:

 

1 x 1 square: 1 square

2 x 2 squares: 4 squares

3 x 3 squares: 4 squares

4 x 4 squares: 4 squares

5 x 5 squares: 1 square

 

Now, can you tell me how many squares contain the black square?

 May 1, 2022

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