https://file.aiquickdraw.com/mathbot/file/1729265064249zqc3cnse.jpg

Let's examine each number line and identify the numbers where the arrows are pointing:

### a) Number line from 10 to 20
The arrow points to the middle of the number line between 10 and 20. The midpoint of 10 and 20 is calculated as:
\[
\frac{10 + 20}{2} = 15
\]
So, the arrow is pointing to **15**.

### b) Number line from 3 to 4
The number line is divided into 10 equal segments, and the arrow is pointing to the middle, which corresponds to 3.5. This is halfway between 3 and 4:
\[
\frac{3 + 4}{2} = 3.5
\]
Thus, the arrow is pointing to **3.5**.

### c) Number line from 1.5 to 2.5
Again, the number line is divided into 10 equal segments, and the arrow points at the middle, which is 2.0. The midpoint of 1.5 and 2.5 is:
\[
\frac{1.5 + 2.5}{2} = 2.0
\]
Thus, the arrow is pointing to **2.0**.

### Summary:
- a) 15
- b) 3.5
- c) 2.0

Do you want more details on any of these, or have any questions?

Here are 5 questions that could extend this discussion:
1. How can you calculate the midpoint of any two numbers on a number line?
2. What does it mean for a number line to be divided into equal intervals?
3. How would the answers change if the divisions were not equal on the number line?
4. Can the number line be used to represent negative numbers in a similar way?
5. How would you estimate the value if the arrow was pointing at a non-midpoint location?

**Tip:** To find the midpoint between two numbers, simply average the two numbers (add them and divide by 2).

Learn how to determine the numbers where arrows are pointing on number lines between values like 10 and 20, 3 and 4, and 1.5 and 2.5. This example demonstrates the midpoint concept and is suitable for Grades 4-6.

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