options: Number Systems and Quantity: students learn to understand the complex number system and reason quantitatively.

Operations & Algebra: students learn to solve problems using algebraic thinking and operations such as addition, subtraction, multiplication, and division. They may learn to identify and explain arithmetic patterns, evaluate or manipulate numerical expressions, and reason with equations and inequalities.

Geometry: students learn to classify geometric figures by their properties, and understand and compare the relationships between them. Students develop and use formulas to compute lengths, areas, and volumes, and they use transformations to generate new shapes and compare existing ones. Geometry can be studied with and without coordinates.

Number & Operations - Fractions: students learn to understand fractions as numbers and may work with them using addition, subtraction, multiplication, and division.

Ratios & Proportional Relationships: students learn to recognize, describe, represent, and reason with ratios, rates, proportional relationships, and percent.

Modeling: students learn to choose and use appropriate mathematics and statistics to analyze real-world empirical situations, improve decisions, and report on their conclusions and the reasoning behind them.

Number & Operations in Base Ten: students learn to work with the base-ten system and build place value understanding.

Counting & Cardinality: students learn to know number names and the count sequence, count to tell the number of objects, and compare numbers.

Functions: students learn to define, use, and evaluate functions to model relationships between quantities.

Measurement & Data: students learn to work with data and measure attributes such as time, money, length, area, and volume. They may learn to compare measurements to operations and convert between different units of measure.

Statistics & Probability: students learn to analyze and produce data distributions, and build understanding of univariate and bivariate data. They learn to interpret data, make statistical inferences, justify conclusions, understand rules of probability, and use probability to make decisions.
problem_activity: Narrative
The purpose of this activity is for students to choose from activities that focus on adding and subtracting or sorting and representing data.
Students choose from any stage of previously introduced centers.
What's Behind My Back?
How Close?
Number Puzzles
Sort and Display
Required Materials
Materials to Gather
Materials from previous centers
Required Preparation
Gather materials from:
What's Behind My Back, Stages 2 and 3
How Close, Stages
1–
3
Number Puzzles, Stages 1 and 2
Sort and Display, Stage 2
Launch
“Today you will choose from centers we have already learned.”
Display the center choices in the student book.
“Think about what you would like to do first.”
30 seconds: quiet think time
Activity
Invite students to work at the center of their choice.
10 minutes: center work time
"Choose what you would like to do next."
10 minutes: center work time
Student Facing
Choose a center.
What's Behind My Back?
[IMG]
How Close?
[IMG]
Number Puzzles
[IMG]
Sort and Display
[IMG]
Activity Synthesis
“Which activity did you choose? What did you like about the activity you chose?”


correct_option_index: 6

9