Today's calculator challenge involves adding or subtracting by powers of 10 to adjust a number 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 make the adjustment, check the answer, and try again as necessary. The challenge is displayed below.

Through the challenge, students will solidify the concept of place value changes-- that having too many in a place corresponds to adjusting the number by the actual value, i.e. 100, 1000, or 10.

**Sound Off!**How do you use calculators in the classroom?

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