Final answer:
Number sense is the ability to understand and work with numbers and their relationships intuitively. It goes beyond rote memorization, enabling problem-solving based on conceptual understanding and logical reasoning.
Step-by-step explanation:
The statement that best describes the concept of number sense is D) An ability to understand numbers and their relationships. Number sense is more than just being able to perform arithmetic operations or use formulas; it encompasses a deep understanding of how numbers relate to one another and being able to use this understanding to solve problems in an intuitive way. Instead of relying solely on memory to apply mathematical rules, number sense allows for a more flexible and logical approach to working with numbers, using conceptual understandings as a foundation.
Problem-solving skills are integral to applying number sense, as they allow individuals to connect mathematical concepts with real-world scenarios. For instance, when working with fractions, our intuition plays a critical role in determining whether to add or subtract, rather than mechanically following a memorized rule.
Understanding the actual concepts in math, such as those presented in equations, enables one to use these concepts as tools. This understanding is what number sense aims to develop. To foster number sense, it's essential to focus on the logic behind mathematical operations and to practice them regularly.