Mayan numerals are represented by dots, bars, and glyphs. Unlike Roman numerals, the Mayans had a representation for zero (the shell glyph). It is intuitive to use for adding and subtracting, and was very advanced for its time. Very similar to our decimal system, the Maya numbers are base 20.
Learn about Mayan numbers while playing games with the cards! Two sets are included: black and white and color. Numbers 0-25, 30, 40, 50, and 100 are represented in this deck (30 cards total - print multiple sets depending on use). A reference sheet is also included for those that need to refer to it while playing.
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If you are not familiar with the card game war, it is a game suitable for even young children. There are also many variations, some of which you can find here and here.