A** number line** is a visual representation of numbers, usually as points on a straight line. It is a useful tool for understanding and comparing numbers, as well as performing basic arithmetic operations such as addition and subtraction.

**Number lines** are typically oriented horizontally, with positive numbers to the right of zero and negative numbers to the left. The distance between each point on the number line represents a specific value, such as 1, 10, or 100.

To use a** number line**, you can start at zero and move in either direction to find the desired number.

For example, to find the number 4, you would start at zero and move 4 units to the right.

To find the number -3, you would start at zero and move 3 units to the left.

Number lines can be used to compare numbers by their position on the line. For example, you can see that 5 is greater than 3 because it is located further to the right on the number line. You can also use a number line to perform basic arithmetic operations.

For example, to **add 4 and 4**, you would start at zero and move 4 units to the right, then move 4 more units to the right. The resulting position is at the** number 8**, which is the sum of 4 and 4.

Number lines are a valuable tool for understanding and working with numbers.

MooMooMath provides free video lessons, tips, and resources in Pre-algebra, Algebra, Algebra 2, and Geometry along with a summary of each video lesson. Under each summary is a practice link that takes teachers, parents, and students to free, interactive websites that reinforce each concept.

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