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Math Games
With Jane and Joanne

Do Your Decimals



Grades 4 and up


  • adding decimals


  • 4 (2 vs. 2) or 2 (1 vs. 1)


  • playing cards Ace (=1) through 10 (10=0)


Player 1 turns over three cards from the top of the deck and uses them to form a number with a decimal. She uses black cards as whole numbers and red cards as decimals.
    Example Player 1 draws a black 4, a red 1, and a red 6 to form the number 4.16.
Then Player 1 takes three more cards and forms another number. She adds together the two numbers.
  • Player 1 draws a red 3, a black 2, and a black 1 to form the number 12.3.
  • She adds 4.16 + 12.3 for a total of 16.46.
Player two takes his turn. He does the same thing.

After this first round, play continues. Both players turn over three new cards per turn. They continue to keep a tally of their scores until one player gets closest to a total of 500 (or 1000) without exceeding it.

Joanne Currah and Jane Felling have created two best-selling math game books -- Shuffling Into Math (for teachers of grades K-3) and All Hands on Deck (grades 1-9). Each book includes simple instructions for more than 100 math games that help children discover math concepts and reinforce math skills. Education World is pleased to present a selection of those activities in this series.

Click to learn more about these books and other exciting products and service from Joanne and Jane's Box Cars and One-Eyed Jacks.

More About Box Cars and One-Eyed Jacks

Joanne Currah and Jane Felling created their company, BOX CARS & ONE-EYED JACKS, for the sole purpose of making math fun -- not threatening or frustrating -- for children. Joanne and Jane spend many days each year on the road as they train teachers to make math fun for kids and run Family Math Nights at schools. To learn more about the authors, their books, and the services they provide, visit them at or email them at [email protected].

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