• ### Basic Lesson

Introduces reading rulers in the scale of inches. Read the ruler and write the length of the red line. This is a scale of a ruler in inches. The horizontal red line is visible from 3 to 5 There is 2 inches distance between the two ends of the red line.

• ### Intermediate Lesson

This lesson uses more advanced measurement skills.

• ### Independent Practice 1

Students practice with 10 reading the ruler problems. The answers can be found below. Read the ruler and write the length of the red line.

• ### Independent Practice 2

Students practice with 10 reading the ruler problems. The answers can be found below.

• ### Independent Practice 3

Students practice with 10 reading the ruler problems. The answers can be found below.

• ### Independent Practice 4

Students practice with 10 reading the ruler problems. The answers can be found below.

• ### Homework Worksheet

Reviews all skills in the unit. A great take home sheet. Also provides a practice problem.

• ### Skill Quiz

10 problems that test ruler skills.

• ### Homework and Quiz Answer Key

Answers for the homework and quiz.

Answers for the lesson and practice sheets.

• ### Basic Lesson

Introduces the concept of measuring length with a ruler. Also includes practice problems. Measurement is an act to measure the length of any object using a ruler, tape etc. The standard unit used to measure any length is the meter. We use "m" for meter. To measure smaller length like the length of your pencil, we use centimeter. This is a scale of length 7 centimeter. Each centimeter is divided into 10 millimeters. The long line between two numbers tells the half of a centimeter i.e. 5 mm.

• ### Reading A Ruler Quiz

5 problems that test measuring length skills and unit conversion.

• ### Independent Practice 1

Contains 5 length measurement and use of unit practice problems. The answers can be found below.

• ### Independent Practice 2

Focuses more on the proper use of units. The answers can be found below.

• ### Homework Worksheet

Provides detailed rulers. Ask students to visualize length. Also touches on the proper use of units.

Provides detailed rulers. Ask students to visualize length. Also touches on the proper use of units.

Answers for both lessons and both practice sheets.

### Why Do We Use Rulers?

The main purpose of using a ruler is to measure small lengths. Students can also use it to draw lines in their notebooks of specific lengths. A ruler usually has centimeter and inch readings marked on it. A ruler can accurately measure a length down to a centimeter or an inch. For calculations that are minor and involve smaller units, a ruler might not be the right measuring instrument as it can only measure accurate to a centimeter or an inch and might give erroneous answers under such circumstances. The biggest use of rulers is in the work of construction and design. During such a work, a worker might need to measure small lengths of the structure that they are designing. A ruler might help in measuring those smaller lengths to the required level of accuracy. A ruler can be of different lengths. Usually, we have a foot-long ruler, but its length can vary from a foot to a meter.

#### Poor InchWorm....

What will happen to the inchworm when the U.S. finally goes metric?

He'll have to become a centipede!

Where can you buy a ruler that is three feet long? At a yard sale.