For teaching addition of integers at the upper primary stage which of the following is least useful ?

Correct Answer: use of chart paper

Step-by-Step Explanation:

1. Understanding the Concept:
Teaching addition of integers (both positive and negative numbers) at the upper primary stage requires concrete or visual models that effectively represent direction and movement (positive numbers representing forward/upward movement and negative numbers representing backward/downward movement).

2. Analyzing the Options:

• Use of stairs: Going up stairs represents adding positive integers, and moving down stairs represents adding negative integers. This physical, kinesthetic approach makes direction concrete.
• Use of lift (elevator): Moving up floors represents positive values, and going down into basements represents negative values. This provides a real-life context for integer addition.
• Use of number line: A number line allows students to visualize moving right for positive numbers and moving left for negative numbers. It is one of the standard and most effective mathematical tools for integer operations.
• Use of chart paper: Chart paper is a passive, static medium primarily used for writing formulas, rules, or drawing static diagrams. It lacks dynamic movement or directional context, making it the least useful among the given options for conceptual understanding of adding integers.

Conclusion:
Therefore, the use of chart paper is the least useful method for teaching the addition of integers at the upper primary stage.