Mathematics Solitaire: keep the number between 0 and 21
Zero21 mathematics solitaire game with cards in which you add or subtract the numbers on the cards, and you have the goal of keeping the result between zero and 21. Add and subtract, practice basic calculation operations, to keep your number in that range. Choose the addition or subtraction card and keep the final result within the minimum and maximum in this online solitaire and maths game.
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