Today's calculator challenge involves correcting an incorrect number that is entered into a calculator. The challenge requires students to demonstrate an understanding of how to represent place value in numbers. Using the calculator, students can determine how to fix the mistake, check the answer, and make adjustments as necessary. The challenge is displayed below.
Through the challenge, students will solidify the concept of place value changes-- that having one too many in a place corresponds to adjusting the number by the actual value, i.e. 100, 1000, or 10.
Note: Part of this challenge is included in "Using Calculators to Explore Mathematical Thinking" by Kathleen Lynch-Davis which appeared in Teaching Children Mathematics (March 16, 2015).
Sound Off! How do you use calculators in the classroom?
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