What method did the student use to show how many more marbles are in Cup A than Cup B?

What method did the student use to show how many more marbles are in Cup A than Cup B?

• A. Calculating a difference by adding or counting on.
• B. Calculating a difference by approximation.
• C. Calculating a difference by comparison.
• D. Calculating a difference by counting backward.

Answer: (C)

The method used by the student to determine how many more marbles are in Cup A than in Cup B involves comparing the two quantities directly. By assessing the numbers of marbles in each cup and identifying the difference through comparison, the student is effectively demonstrating a fundamental understanding of how to analyze two sets of items. This approach emphasizes the relationship between the two groups, allowing the student to visually or numerically gauge the difference. When you compare the quantities, you can clearly see how many more marbles exist in one cup versus the other, which is at the heart of basic arithmetic understanding. The other methods listed all have different focuses or processes. For example, counting backward would involve starting from Cup A's total and decrementing until reaching the total of Cup B, which is a different strategy. Approximation might also lead to less precise results as it doesn't rely on exact counting. Adding or counting on can work in some situations but is typically not the primary method for determining a difference when direct comparison is an option.

The method used by the student to determine how many more marbles are in Cup A than in Cup B involves comparing the two quantities directly. By assessing the numbers of marbles in each cup and identifying the difference through comparison, the student is effectively demonstrating a fundamental understanding of how to analyze two sets of items.

This approach emphasizes the relationship between the two groups, allowing the student to visually or numerically gauge the difference. When you compare the quantities, you can clearly see how many more marbles exist in one cup versus the other, which is at the heart of basic arithmetic understanding.

The other methods listed all have different focuses or processes. For example, counting backward would involve starting from Cup A's total and decrementing until reaching the total of Cup B, which is a different strategy. Approximation might also lead to less precise results as it doesn't rely on exact counting. Adding or counting on can work in some situations but is typically not the primary method for determining a difference when direct comparison is an option.