Difficulty: Medium

Average Score: 67%

Which of the following would be the best evidence of number sense in first graders?

Rationale

Finding all pairs of numbers that sum to 10 demonstrates number sense in first graders.

This activity requires an understanding of addition, number relationships, and the ability to manipulate numbers, all of which are key components of number sense. It reflects a deeper comprehension of how numbers interact rather than just rote memorization or recognition.

A (Recognizing shapes in the environment) YOUR ANSWER

While recognizing shapes involves spatial awareness and is an important skill, it does not directly relate to number sense. Number sense specifically pertains to understanding and working with numbers, which is not demonstrated through geometric recognition.

B (Saying the numbers from 1 to 20) YOUR ANSWER

This activity primarily tests rote memorization of number sequences rather than the ability to understand and manipulate numbers. Simply reciting numbers does not indicate a first grader's ability to apply number concepts or engage meaningfully with mathematical operations.

C (Using a calculator to add whole numbers) YOUR ANSWER

Using a calculator shows the ability to perform calculations but does not reflect a true understanding of number concepts or relationships. Number sense involves mental math skills and the ability to reason about numbers, which is not demonstrated when a calculator is used as a crutch.

D (Finding all pairs of numbers that sum to 10) CORRECT

This task involves actively engaging with numbers, understanding addition, and recognizing relationships between numbers. It showcases a first grader's ability to think critically about numbers and their combinations, providing strong evidence of number sense development.

Conclusion

To summarize, demonstrating number sense in first graders involves their ability to understand and manipulate numbers rather than simply recognizing them or relying on tools like calculators. Finding pairs of numbers that sum to 10 not only requires addition skills but also reflects a deeper comprehension of numerical relationships, making it the best evidence of number sense among the provided options.

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