User's Manual

LER 9301

The Demonstration Ruler is great for modeling linear measurement.

Track measurements from 0–18 inches (in.) or 0–45 centimeters/centimetres (cm)

with the adjustable red band. Display the Demonstration Ruler on any magnetic

receptive surface, such as a white board.

Suggested Use

Discuss with students some earlier methods of measurement, such as gauging

length with thumbs and feet. Guide students in measuring a few smaller objects

using the width of their thumbs. Record and compare the results. Lead students to

the conclusion that everyone’s thumb width is not the same. Therefore, a

“standard” unit, such as inches or centimeters/centimetres, is necessary for

everyone to achieve the same measurements.

• Familiarize students to the ruler and its markings.

• Be sure to identify by which units you are measuring (in. or cm).

• If using a white board, draw a line on the board and position the ruler

underneath.

• Align the left end of the line to 0 on the left end of the ruler.

• When measuring, always hide the red band from view (as close to 0 as

possible).

• Gently slide the band from left to right and align the end of the red band with

the end of the line or object being measured.

• Emphasize that the left end of the object or line being measured must always be

“flush” (even) with 0 on the left end of the ruler.

• Students should recognize that accurate

measurements begin on 0, which is usually

(but not always) on the left edge of the ruler.

• You may need to remove the ruler from the

magnetic surface while adjusting the length of

the red band.

Demonstration Ruler

Ages

Grades

K+

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LER 9301 Ages Grades 5+ K+ Demonstration Ruler The Demonstration Ruler is great for modeling linear measurement. Track measurements from 0–18 inches (in.) or 0–45 centimeters/centimetres (cm) with the adjustable red band. Display the Demonstration Ruler on any magnetic receptive surface, such as a white board. Suggested Use Discuss with students some earlier methods of measurement, such as gauging length with thumbs and feet.
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You may write on the front face of the Demonstration Ruler with a dry-erase marker. (Do not write on the red band.) Intervention Strategies • Linear Measurement: Use number lines to introduce the concept of linear measurement, rulers, and standard units. Emphasize that measuring with a ruler is very similar to counting from left to right on a number line. • Whole Units: Model measurement to the nearest whole unit. Say, “That’s about 3 inches (or cm),” or, “That measures closest to 3 inches (or cm).