IT WAS MADE IN 1928 BY YOUR UNCLE. Yes, I yelled at you. Get over it.
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there are 55 squares in the bingo card
A cube
Well, darling, a 7 by 7 grid contains 49 squares in total. This includes 1 big square, 16 smaller squares made up of 4 units, 20 squares made up of 3 units, 12 squares made up of 2 units, and finally 1 square made up of 1 unit. So, in short, you've got yourself a grand total of 49 squares to count in that sassy little grid of yours.
In a square made up of sixteen smaller squares, there are a total of 30 squares. This includes the one large square, the sixteen smaller squares, nine squares formed by combining four smaller squares, and four squares formed by combining nine smaller squares. Each of these squares contributes to the total count of 30 squares within the larger square.
A 3x3 grid is made up of 9 small squares. However there are also squares of larger sizes. There are 4 2x2 squares. There is also the one big square that uses all the 3x3 area. In total this gives us 9+4+1 = 14. Thus there are 14 squares in a 3x3 grid.