This document provides information about classroom teaching aids including a centimeter ruler, inch ruler, and protractor. The centimeter ruler is marked from 0 to 30 centimeters in half centimeter increments. The inch ruler is marked from 0 to 18 inches in quarter inch increments. The protractor is marked from 0 to 180 degrees in 10 degree increments.

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Teaching Aid Master 3
Centimeter Ruler, Inch Ruler, and Protractor
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centimeters
80 90 100 1
70 100 90 80 7 10 1
0 10 0 2
6 0 1 60 0 1
50 0 12 3
50 0
13
14 0
14 0
4
0 30
0
4
15
160 30
150
0
3
160 10
180 170 20
20
170 18
10
0
0
0
Multiple-Use Classroom Resources
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inches
Teaching Aid