Close It Up

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As learners play this challenging strategy game, they build understanding of area and perimeter. On each turn, a player draws a line between two dots next to each other on the grid. When you close a shape, mark it as yours. You can make any shapes, as long as they’re closed. Keep taking turns until there is no more room. The player with the most area 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 8 - 14

Resource Types:
Activity, Game


Materials List (per group of students)

  • one Close It Up game board per pair
  • pencils


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

Informal Categories

  • Games


To use this activity, learners need to:

  • see
  • read

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