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This lesson (on pages 46-55 of PDF) features two strategy board games -- one from Ghana and one from China. The first game, Achi, is a cross between checkers and tic-tac-toe.

Learners make a counting/estimating jar to exchange with friends or bring home.

In this activity about encryption, learners cut out a secret decoder badge from a handout and use it to encode messages to each other.

Build a house you can fit inside, using cardboard tubes.

In this activity, learners will predict the size of a giant scale model of a comb or other rectangular object, then make one. If you tripled the size of a dollar bill, could you sit on it?

Choose a recipe to double (or triple, quadruple, or halve). Show everyone the recipe and engage them in figuring out: How much will we need to increase the recipe to feed everyone?

This activity is a hit for family events and all ages—some will finish in 45 minutes; others can go on for hours.

Learners create an Incan counting device called a quipu (pronounced kee-poo).

This is a lesson plan for an activity in which learners, playing the role of archeologists, use math concepts about number bases to decipher the Dresden Codex, an ancient Mayan document.

In this activity, learners will participate in a scavenger hunt involving sizes, shapes, and numbers. This activity works well with a whole group, individuals, or families.

In this activity, learners imagine what the world might look like if we could build an elevator to space!