Activity Description Play a "Connect-Four" style game, earning a game piece each time you answer an estimation question correctly. This game asks the players to estimate the answer to addition, multiplication, and percentage questions. Choose difficulty level, question types, and time limit. Estimator Four is one of the Interactivate assessment games.

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Estimator Four

Place in mathematics curriculum:

• Introduce students to the uses and limits of estimation
• Reinforce understanding of addition, multiplication, and percentage problems involving large numbers

This activity allows two users to play a game of estimation where each player tries to connect four game pieces in a row before his or her opponent does. The players earn game pieces by accurately estimating the answers to various problems. Users can choose to estimate addition, multiplication, and percentage problems. This activity would work well in groups of 2 for about 25-30 minutes if you use the exploration questions and 15-20 minutes otherwise.

Preparations for this activity:

• Encourage the students to estimate rather than trying to compute the values exactly
• Discuss how estimation is not as accurate as calculation
• Explain the difference between close, really close, and almost perfect (almost perfect is the most accurate)
• Suggest that the students eventually increase the difficulty level