# Estimate on a Number Line Worksheets

What is a Numbers Line, and How Does it Help in Estimation? The number system is represented in many ways, but the most common method of representing the whole number system is the use of a number line. A number line is an imaginary line on which all the numbers, beginning from zero and extending to either side of point zero to positive and negative infinity, are written. The right side of the point zero on a number line represents the positive numbers, whereas the left side of it represents the negative numbers. Zero, of course, has no sign. There are many uses of a number line, for example, marking a solution set of the value range of a variable in an equation. One of its early uses is that number lines are used to make estimates of elementary mathematical operations. For instance, on the number line, we can easily see the sum or difference between two numbers, and quickly, just by looking at it, we can give an estimate of the answer.

• ### Basic Lesson

Demonstrates the basic concept point estimation and use of a scale. Also includes practice problems. Estimate what number is selected on the number line.

• ### Intermediate Lesson

Uses larger number line than what is presented in the basic lesson. 1. Estimate what number is selected on the number line. 2. Check your answer.

• ### Independent Practice 1

8 problems ask you to estimate what number is selected on the number line. The answers can be found below.

• ### Independent Practice 2

Features 5 problems that have a range of 1 to 20 on a number line.

• ### Homework Worksheet

Contains 4 problems. An example is provided.

• ### Skill Quiz

7 problems that test introductory scale and estimation skills.

• ### Homework and Quiz Answer Key

Answers for the homework and quiz.

• ### Lesson and Practice Answer Key

Answers for both lessons and both practice sheets.

#### Rows and Columns

For estimating items that are in a specific order or are in rows, such as books, ceiling lights, bricks or blocks, simply count the number of items in one row and multiply that number by the number of rows.