2.MATH.9.B

Describe the inverse relationship between the size of the unit and the number of units needed to equal the length of an object.

Grade 2 · Texas Essential Knowledge and Skills (TEKS) · TEKS 2012

Standard Unwrapping

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Vocabulary
inverse relationshipsizeunitnumber of unitslengthobject
Skills
  • describe (inverse relationship between unit size and number of units for length) #dok2
  • explain (how changing unit size affects the number of units needed to measure length) #dok2
  • identify (unit, length, and number relationships in measurement situations) #dok1
Learning Targets
  • I can identify the unit, length, and number relationships in a measurement situation. #dok1
  • I can describe the inverse relationship between the size of the unit and the number of units needed to equal the length of an object. #dok2
  • I can explain how using different sized units changes how many are needed to measure the same length. #dok2
Big Ideas
  • The size of the measurement unit affects the number of units needed to measure an object's length.
  • There is a predictable, inverse relationship between unit size and the number of units for a fixed length.
Essential Questions
  • What happens to the number of units you need as the unit size gets bigger?
  • Why does the size of the unit you use matter when measuring something?
  • How can you tell if you should use a bigger or smaller unit to measure something?
  • Can two people measure the same object and get different numbers? Why or why not?
  • How does changing the unit size help or hurt your measurement accuracy?