Domain

Measurement and Data

Cluster

Measure and estimate lengths in standard units

Standard(s)

NC.2.MD.1 Measure the length of an object in standard units by selecting and using appropriate tools such as rulers, yardsticks, meter sticks, and measuring tapes.

Materials

 pencil

Task

Say, Maria wants to measure the length of the hallway outside of her classroom.  She has a ruler and a yardstick.  Which tool do you think she should use?  Explain your reasoning.

Continuum of Understanding

Not Yet Proficient

Needs prerequisite concepts

Selects the correct tool:

❑    Selects the yardstick

❑    Explains why the yardstick is a better tool for distances longer than a foot

Progressing

·      Incorrectly states that the ruler would be the more appropriate tool.

·      Recognizes that a yardstick is longer than a ruler, but the explanation is weak or nonexistent.

·      Does not recognize that the yardstick is longer than the ruler, but the justification indicates an understanding of the need for a longer tool for longer lengths/distances.

Meets Expectation

·      States that the yardstick would be the more appropriate tool.

·      Recognizes that a yardstick is longer than a ruler.

·      Provides an explanation that clearly justifies the use of a yardstick for longer lengths/distances. May include an understanding that the more often the tool must be iterated, the more likely there are to be mistakes in measuring.