This 52 card deck features positive and negative rational and irrational numbers including decimals, fractions (improper and mixed numbers), square roots, cube roots, and percentages. My students use this deck to practice comparing rational and irrational numbers and estimating values of square roots and cube roots by playing a game of "War." Students are dealt cards, each student places a card in the center, the card with the greatest value wins all the cards, and the student with the most car