concrete operations online puzzle

3x3 - 9 pieces6x5 - 30 pieces8x7 - 56 pieces9x8 - 72 pieces10x9 - 90 pieces12x11 - 132 pieces14x12 - 168 pieces15x13 - 195 pieces24x21 - 504 pieces34x30 - 1020 pieces Start a new game

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