*“Secret Number Codes” is free on this website for one week only. It’s an excerpt from 312 Things To Do with a Math Journal, available as a special pre-publication ebook edition at my publisher’s store or for preorder through many online retailers. Read more about my playful math books here.*

Many parents remember struggling to learn math. We hope to provide a better experience for our children.

And one of the best ways for children to enjoy learning is through hands-on play.

This game challenges players to think flexibly so they can interpret clues and deduce their opponent’s secret numbers.

## Secret Number Codes

**Math Concepts:** arithmetic, algebra, logical deduction.

**Players:** two players or two teams.

**Equipment:** pencil and paper, or individual whiteboards and markers. Calculators optional.