25cm x 25cm = 625cm
11 tiles.
25cm x 4 sides = 100 cm perimeter
A 2ft x 2ft square is 4 square feet and 42 squares will be needed to cover 168 square feet.
49 squares I believe?
There are 100 square units
42.3 such squares.
A 5 cm x 5 cm square has an area of 25cm².
200
26,928 1" x 1" squares to cover 187 square feet.
16 Answer #2 It is 16 if you just count the 1 x 1 squares but the 16 squares also form a 4x4 square. There are also 2x2 squares and 3x3 squares in the pattern. 16 1x1 squares 9 2x2 squares 4 3x3 squares 1 4x4 square 30 squares (possibly more?)
Sum of N2 for N=1 to X, and X is the number of squares across the top or side on the large square.