5. Ellie solves the subtraction problem 2.5 -0.13 with tooth- picks. She represents 2.5 with 2 bundles of 10 toothpicks and 5 individual toothpicks, and she represents 0.13 with 1 bundle of 10 toothpicks and 3 individual toothpicks. Ellie gets the answer 1.2. Is she right? If not, explain why not and discuss how she could use the toothpicks correctly.

5. Ellie solves the subtraction problem 2.5 -0.13 with tooth- picks. She represents 2.5 with 2 bundles of 10 toothpicks and 5 individual toothpicks, and she represents 0.13 with 1 bundle of 10 toothpicks and 3 individual toothpicks. Ellie gets the answer 1.2. Is she right? If not, explain why not and discuss how she could use the toothpicks correctly.

Algebra and Trigonometry (6th Edition)

6th Edition

ISBN:9780134463216

Author:Robert F. Blitzer

Publisher:Robert F. Blitzer

ChapterP: Prerequisites: Fundamental Concepts Of Algebra

Section: Chapter Questions

Problem 1MCCP: In Exercises 1-25, simplify the given expression or perform the indicated operation (and simplify,...

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**Problem 5: Toothpick Subtraction**

Ellie solves the subtraction problem $2.5 - 0.13$ using toothpicks. She represents $2.5$ with 2 bundles of 10 toothpicks and 5 individual toothpicks. She represents $0.13$ with 1 bundle of 10 toothpicks and 3 individual toothpicks. Ellie calculates the result as $1.2$.

**Is she correct?**

If not, explain the error and discuss how she could use the toothpicks correctly.

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In this exercise, students are encouraged to visualize and solve subtraction using physical representation to better understand decimal calculations.

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