Find the following using the number line:
`7xx3`

Answer

To solve the problem \(7 \times 3\) using a number line, we can follow these steps:

### Step-by-Step Solution:

1. **Draw a Number Line**: Start by drawing a horizontal line and marking points on it. Label the points from 0 to 21. This will help us visualize the multiplication.

**Hint**: Make sure to space the numbers evenly for clarity.

2. **Identify the Groups**: Since we are multiplying \(7\) by \(3\), we need to think of this as adding \(3\) a total of \(7\) times.

**Hint**: Remember that multiplication can be thought of as repeated addition.

3. **Mark the First Group**: Start at \(0\) and move \(3\) units to the right. This takes you to \(3\).

**Hint**: Count the units carefully as you move along the number line.

4. **Mark the Subsequent Groups**: From \(3\), move another \(3\) units to the right. This takes you to \(6\). Repeat this process:
- From \(6\), move \(3\) units to \(9\).
- From \(9\), move \(3\) units to \(12\).
- From \(12\), move \(3\) units to \(15\).
- From \(15\), move \(3\) units to \(18\).
- From \(18\), move \(3\) units to \(21\).

**Hint**: Keep track of how many groups of \(3\) you have counted.

5. **Count the Total**: After marking all the groups, you will see that the final point you reached is \(21\). This means \(7 \times 3 = 21\).

**Hint**: Double-check your counting to ensure accuracy.

### Final Answer:
Thus, \(7 \times 3 = 21\).