49 squares I believe?
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A 2ft x 2ft square is 4 square feet and 42 squares will be needed to cover 168 square feet.
Sum of N2 for N=1 to X, and X is the number of squares across the top or side on the large square.
4 - without cutting the 1cm x 1cm squares.
Assuming it is 4cm x 4cm, then there would be 16 1cm x 1cm squares. * * * * * But, there are also 9 2cm x 2cm squares, 4 3cm x 3cm squares and 1 4cm x 4cm square. That makes 30 in all.
1 square meter = 100 x 100 = 10000 square centimeters 9 sq meter = 9 x 10000 sq cm = 90000 squares