Math Example: Algebra Tiles: Example 13

Topic

Numerical and Algebraic Expressions

Description

This example illustrates the subtraction of -7 from -7 using algebra tiles. The image shows 7 red tiles representing -7, and 7 red tiles are removed to demonstrate the subtraction of -7. The result is zero tiles remaining, visually showing that -7 - (-7) = 0.

Algebra tiles are a powerful tool for teaching numerical and algebraic expressions, especially when dealing with operations involving negative numbers. By providing a visual and tactile representation of abstract concepts, these tiles help students develop a concrete understanding of mathematical operations. This approach is particularly beneficial for students who struggle with traditional abstract methods, as it allows them to physically manipulate the tiles and observe the outcomes of different operations.

Presenting multiple worked-out examples is crucial for students to fully grasp mathematical concepts. Each example offers a new perspective on the topic, allowing students to see how the same principles apply in different scenarios. This repetition and variety help reinforce the underlying concepts, improve pattern recognition, and develop problem-solving skills. As students encounter various examples, they become more adept at applying their knowledge to new and unfamiliar situations, building confidence in their mathematical abilities.

Teacher Script: "Let's explore what happens when we subtract a negative number from itself using algebra tiles. We start with 7 red tiles for negative 7. To subtract negative 7, we remove all 7 red tiles. What do we have left? That's right, we have zero tiles remaining. This shows us that negative 7 minus negative 7 equals zero. Can you think of other examples where subtracting a number from itself would give us zero, regardless of whether it's positive or negative? How does this concept relate to the idea of additive inverses?"

For a complete collection of math examples related to Numerical and Algebraic Expressions click on this link: Math Examples: Algebra Tiles Collection.