General Information
Subject Area: Mathematics (B.E.S.T.)
Grade: 2
Strand: Measurement
Date Adopted or Revised: 08/20
Status: State Board Approved
Benchmark Instructional Guide
Connecting Benchmarks/Horizontal Alignment
Terms from the K-12 Glossary
- NA
Vertical Alignment
Previous Benchmarks
Next Benchmarks
Purpose and Instructional Strategies
The purpose of this benchmark is to directly compare the length of two objects measured using the same unit and determine the difference.- Instruction includes selecting the appropriate tool to measure.
- Instruction includes helping a student choose a method they can use reliably to determine the difference.
- Instruction includes helping students record the appropriate measurement when the object falls between two whole number measurements.
Common Misconceptions or Errors
- Students may misalign the ruler with the object and measure an object from 1 instead of 0.
- Students may count all tick marks, not just the whole-unit marks, when reading a ruler.
- Students may leave gaps when measuring objects.
Strategies to Support Tiered Instruction
- Instruction includes providing opportunities to make and use rulers to construct understanding of how lengths of each unit align to tick marks and numbers on a ruler.
- For example, students make and use their own ruler in three phases.
- Phase 1: Using paper square tiles glued to a strip of cardstock, students count the units that span an object to measure.
- For example, students make and use their own ruler in three phases.
- Phase 2: Labeling each square tile with a number in the center of the unit, students use numbers to count the units of measure.
- Phase 3: Eliminating the square tiles, students draw tick marks at the end of each unit and label with a number below, the starting at zero. Students reference the numbers to count the units.
Instructional Tasks
Instructional Task 1 (MTR.4.1)
Provide students with an object of a given measurement in various units.- Part A. Find objects in the classroom or that are shorter or longer than the given object and find the difference using the common unit.
- Part B. Discuss which tool was more appropriate to use and what strategy was used to find the difference.
Instructional Items
Instructional Item 1
A pair of scissors measure 22 centimeters long, and a glue stick measures 14 centimeters long. Which statement below is true about the measurement of the objects?- a. The glue stick is 9 cm. longer than the scissors.
- b. The glue stick and scissors are 8 cm. long.
- c. The scissors are 8 cm. longer than the glue stick.
*The strategies, tasks and items included in the B1G-M are examples and should not be considered comprehensive