Numford
Least count

Least count of a protractor

A school protractor is marked in whole degrees, so its least count is 1°.

Least count

Least count. The smallest value an instrument can read. It is the smallest error you can make in one reading. Least count = the smallest division on the scale.
Least count

1°

one smallest division

1 °

Least count = the smallest division on the scale.

The rule

Least count = the smallest division on the scale

A protractor is used for angles in degrees. The working for the textbook numbers is 1 °.

Related

Other instruments

Questions

Protractor: quick answers

What is the least count of a protractor?

A school protractor is marked in whole degrees, so its least count is 1°. Least count = the smallest division on the scale.

How do I find the least count of my protractor?

Least count = the smallest division on the scale. For the instrument in front of you, read the scale and use your own numbers in the tool above.

Why does the least count matter?

The least count is the smallest reading you can make, so it sets the smallest error in a single measurement. Protractor measures angles in degrees.

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