addition and subtraction online puzzle

2x4 - 8 pieces4x7 - 28 pieces5x9 - 45 pieces7x11 - 77 pieces7x12 - 84 pieces8x13 - 104 pieces8x14 - 112 pieces10x16 - 160 pieces11x18 - 198 pieces17x29 - 493 pieces Start a new game

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