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A pentomino is a polyomino composed of five congruent squares, connected along their edges. They look a bit like nets, but with only 5 squares. Or some of the 5 square blocks in tetras.
Count the number of squares across the top of the grid, the count the number of squares down the side of the grid. Then multiply these two numbers If you have a grid of 100 squares by 60 squares then the number of squares in the grid is 100x60 = 6000