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## Common Core Standard: 6.NSC.6

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.