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square numbers are the numbers that are... 1x1=1 2x2=4 3x3=9 4x4=16 ..... 1,4,9,16,25,36,49,64,81,100,121,144.........
1x1 = 1 2x2 = 4 3x3 = 9 4x4 = 16 ... Up to 31x31
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1x1 = 1 2x2 = 4 3x3 = 9 4x4 = 16 5x5 = 25 6x6 = 36 you get the picture...49, 64, 81, 100, 121, 144, 169, etc.
In a 4x3 grid, you can count the number of squares of various sizes. There are 12 unit squares (1x1), 6 squares of size 2x2, and 1 square of size 3x3. Therefore, the total number of squares is 12 + 6 + 1 = 19.