GLOBE Assessment
Grade K-4

Math Activity for Protocol Test

Four groups measured the distance from the tree to the spot where they used the clinometer. Group 1 recorded the distance as 155 cm. Group 2 recorded the distance as 150 meters. Group 3 recorded the distance as 148 mm. Group 4 recorded the distance as 138 m. Which group used the correct units? How can you tell?

NCTM Standard: measurement 1.1 through 1.3
Which of the measurements are greater than a meter in length?

NCTM Standard: measurement 1.2 through 1.3
Arrange the measurements (above) from smallest to largest.

NCTM Standard: measurement 1.2 through 1.3.

Clinometer Protocol Test

The Clinometer protocol test assesses students' ability to construct and use a clinometer.

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students--> Student activity & Level of Performance + appropriate student performance - inappropriate student performance n.a. not appropriate or not observed

Collect: clinometer sheet table of tangents cardboard drinking straw metal nut/washer 15 cm of thread/floss glue, scissors hole-punch, tape

Construct Clinometer

Attach clinometer to one side and table of tangents to other side of cardboard

Punch hole at marked circle; tie 15 cm. string (attached to metal nut/washer) through hole

Tape straw along designated line to use as a sight

Using the Clinometer

Stand on level ground with object being measured

Measure & record height of eyes from the ground

Sight top of object through clinometer straw

Partner records – BVW (string + washer)

Measure & record distance from observer to object

Calculate & record height of object: Tree height = (TAN – BVW x distance to object) + eye height