Reading a ruler - Scarsdale Public Schools
SCARSDALE MIDDLE SCHOOL
Page ___ TECHNOLOGY EDUCATION
Ruler Scales:
READING A RULER
1"
1/2"
1/4"
3/4"
1/8" 3/8" 5/8" 7/8"
THE NUMBER FOR WHOLE INCHES APPEARS TO THE LEFT OF ITS MARK.
8ths
1
2
8ths Scale: Each inch is divided into 8 parts and the smallest division is 1/8 of an inch. All fractions must have a denominator of 8, 4 or 2.
3/16" 7/16" 11/16" 15/16" 1/16" 5/16" 9/16" 13/16"
16ths
1
2
16ths Scale: Each inch is divided into 16 parts and the smallest division is 1/16 of an inch. All fractions must have a denominator of 16, 8, 4 or 2.
Rulers may also have scales of 32nds and 64ths. Divisions smaller than 64ths are too difficult to read. Specialized rulers may have different scales that aren't based on 8ths.
Making a Measurement:
1. Determine what scale you are using. 2. Align the left end of the ruler with one edge of the part you are
measuring. 3. Count the number of whole inches (if there are any). 4. Count the remaining number of divisions (if there are any) and
add them to the number of whole inches. 5. Reduce the fraction (if there is one) to its simplest form.
Example: Measure the width of the gray object.
16ths
1
2
1 2
3
4
1. Ruler's scale is 16ths. 2. Ruler is aligned properly. 3. 2 whole inches. 4. Plus 8 16ths = 2 8/16". 5. Reduce: 2 8/16" = 2 ?".
Remember:
? We don't use the metric system in this country. All of your results must be in inches or feet. NO MILLIMETERS, CENTIMETERS OR METERS.
? 8ths and 16ths are the denominators of fractions. Any fractions in your results should have a denominator of 8, 4 or 2 if you are using the 8ths scale and 16, 8, 4 or 2 if you are using 16ths. Also, your results should not contain any decimals.
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