Measuring with different units

CONCEPTUAL

Mathematics›Measurement|Ages 7—8|ID: mt_jHv4BgRK8B

Measure the length of an object using two different length units and describe how the measurements relate to the size of the unit chosen

Mastery Evidence

Measure a desk in both centimetres and inches and compare the two numbers
Explain that measuring with a smaller unit gives a larger number
Predict whether a measurement in centimetres will be greater or less than in inches

Assessment Prompt

“If [child] measures the same book in centimetres and then in inches, can they explain why the numbers are different even though the book hasn't changed size?”

Curriculum Standards1 alignment

2.MD.2Common Core State Standards for Mathematics

Measure length with different units

Measure the length of an object twice, using length units of different lengths for the two measurements; describe how the two measurements relate to the size of the unit chosen.

Measurement and Data

Prerequisites1

Measuring length (age 7+)
hardAges 7—8

Show full prerequisite tree

Measuring length (age 7+) hard
Must be able to measure with tools before comparing measurements in different units
- Measuring length (age 6+) hard
  Using standard measurement tools extends measuring with non-standard units
  - Measuring length and height (age 5+) hard
    Measuring with iterated units extends Y1 beginning to measure length
    - Comparing Lengths & Heights hard
      Measuring length with units requires first being able to compare lengths directly
      - Measurable Attributes of Objects hard
        Comparing lengths/heights requires first identifying length as a measurable attribute
  - Measuring length soft
    Measuring with units benefits from ability to order and compare lengths
    - Comparing Lengths & Heights hard
      Ordering 3 objects by length and indirect comparison extends direct length comparison
      - Measurable Attributes of Objects hard
        Comparing lengths/heights requires first identifying length as a measurable attribute
- Choosing measurement units soft
  Choosing appropriate tools builds on choosing appropriate units
  - Capacity and volume hard
    Using standard units for capacity extends from beginning to measure capacity
    - Comparing Capacity hard
      Measuring capacity with units requires first being able to compare capacities
      - Measurable Attributes of Objects hard
        Comparing capacity requires understanding capacity as a measurable attribute
  - Measuring length and height (age 5+) hard
    Using standard units for length extends from beginning to measure length
    - Comparing Lengths & Heights hard
      Measuring length with units requires first being able to compare lengths directly
      - Measurable Attributes of Objects hard
        Comparing lengths/heights requires first identifying length as a measurable attribute
  - Measuring mass and weight hard
    Using standard units for mass extends from beginning to measure mass
    - Measuring mass and weight (age 4+) hard
      Measuring mass with units requires first being able to compare masses directly
      - Measurable Attributes of Objects hard
        Comparing mass/weight requires first identifying mass as a measurable attribute

Unlocks0

No topics build on this one.