Mystery Number

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Combine logic and numbers in this game for all ages. Players start with a 10x10 grid of the numbers 1 to 100. One person chooses a secret number and announces the range in which it falls. Other players ask yes or no questions to identify the number. They cross out the numbers on the board that are no longer possibilities. The player who identifies the secret number wins. [Activity is publicly available through a web crawler capture on]

Quick Guide

Preparation Time:
Under 5 minutes

Learning Time:
5 to 10 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 What's My Number? game board per pair
  • pencils


  • Mathematics
    • Algebra
      • Patterns
    • Data Analysis and Probability
      • Data Collection
    • Number and Operations
      • Decimals
      • Exponents
      • Fractions
      • Multiples and Factors
      • Number Systems
      • Operations
    • Reasoning and Proof
  • The Nature of Technology
    • The Design Process
      • Problem Solving
  • The Nature of Science
    • The Scientific Process
      • Asking Questions
      • Gathering Data
      • Formulating Explanations

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