options: Relate addition and subtraction to length.

Measure and estimate lengths in standard units.

Measure lengths indirectly and by iterating length units.

Geometric measurement: recognize perimeter as an attribute of plane figures and distinguish between linear and area measures.

Classify objects and count the number of objects in each category.

Convert like measurement units within a given measurement system.

Tell and write time.

Represent and interpret data.

Geometric measurement: understand concepts of area and relate area to multiplication and to addition.

Work with time and money.

Geometric measurement: understand concepts of angle and measure angles.

Describe and compare measurable attributes.

Geometric measurement: understand concepts of volume and relate volume to multiplication and to addition.

Solve problems involving measurement and conversion of measurements from a larger unit to a smaller unit.

Solve problems involving measurement and estimation of intervals of time, liquid volumes, and masses of objects.
problem_activity: Stage 1: Any Way
Required Preparation
Materials to Gather
Collections of objects
Materials to Copy
Blackline Masters
Sort and Display Stage 1 Recording Sheet

Narrative
Students sort 10–20 objects into two or three categories and then show how they sorted. Provide students with a group of items that will be interesting for them to work with such as:
pattern blocks
connecting cubes
counters
combination of the blocks, cubes, and counters
sets of books
Students then show their representation to a partner and ask questions that can be answered about their collection of objects.
Additional Information
Create collections of 10–20 objects with up to three attributes by which to sort.


correct_option_index: 7