Learning Resources Baby Toy LER 9301 User Manual

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. 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.  
 

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