Twelve at a Time

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As learners play this game, they build skills in area, perimeter, multiples and factors. They take turns making rectangles with 12 squares on the grid. They try to fit their shapes on the grid in a way that blocks the other player. They keep taking turns until there is no room to add another shape. The player with the most shapes at the end wins. Includes easier and harder variations. Available as a downloadable PDF and in Spanish. [Activity is publicly available through a web crawler capture on]

Quick Guide

Preparation Time:
Under 5 minutes

Learning Time:
10 to 30 minutes

Estimated Materials Cost:
free per group of students

Age Range:
Ages 4 - 14

Resource Types:
Activity, Game


Materials List (per group of students)

  • one Twelve at a Time game board per pair
  • pencils


  • Mathematics
    • Geometry
      • Plane Geometry
    • Number and Operations
      • Multiples and Factors
      • Operations
  • The Nature of Technology
    • The Design Process
      • Problem Solving

Informal Categories

  • Games


To use this activity, learners need to:

  • see

Learning styles supported:

  • Involves teamwork and communication skills
  • Involves hands-on or lab activities


Foreign language versions of this resource:

Access Rights:

  • Free access


Source Collection

  • Mixing in Math


Funding Source:

  • NSF, ESI-0406675 and DRL-0713537