deltas math online puzzle

7x4 - 28 pieces9x5 - 45 pieces11x6 - 66 pieces13x7 - 91 pieces15x8 - 120 pieces17x9 - 153 pieces19x10 - 190 pieces21x11 - 231 pieces23x12 - 276 pieces25x13 - 325 pieces27x14 - 378 pieces29x15 - 435 pieces Start a new game Create a multiplayer game table

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