Marks on a Ruler

Often, when students see standard rulers with numbers and tick marks, they incorrectly believe that the numbers are counting the marks rather than the units of space between the marks. What is one assessment technique to establish if a student understands how to use a ruler?

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• 4 inches

• 4 inches

Determine the measurement of the picture by reading the ruler.

• 2 1/2 inches

• 3 1/2 inches

• 1 1/2 inches

• 4 inches

Determine the measurement of the image by reading the ruler.

• 9 1/2 in.

• 8 1/2 in.

• 7 1/2 in.

• I am unsure of the answer.

Determine the measurement of the image by reading the ruler.

• 3 in.

• 2 in.

• 2 1/2 in.

• I am unsure of the answer.

Which measurement is closest to the length of the sticker?

• 4 in.

• 2 1/2 in.

• 2 in

• 1 1/2 in

How long is this?

• 7 1/4

• 7 3/4

• 7 1/2

• 7 3/8

Determine the measurement of the image by reading the ruler.

• 4 in.

• 3 in.

• 2 in.

• 1 in.

Determine the measurement of the image by reading the ruler.

• 11 1/2 in.

• 12 in.

• 11 in.

• I am unsure of the answer.