1. The problem is to understand how to represent numbers on a number line. 2. A number line is a straight line where each point corresponds to a real number. 3. The center point is usually zero, called the origin. 4. Numbers to the right of zero are positive, and numbers to the left are negative. 5. Each unit on the line represents an increment of 1. 6. To plot a number, start at zero and move right for positive numbers or left for negative numbers. 7. For example, to plot $-3$, start at zero and move 3 units to the left. 8. To plot $4$, start at zero and move 4 units to the right. 9. This visual helps understand order and magnitude of numbers. 10. Number lines can also represent fractions and decimals by dividing units into smaller parts.