options: Understand properties of multiplication and the relationship between multiplication and division.

Add and subtract within 20.

Understand the connections between proportional relationships, lines, and linear equations.

Analyze and solve linear equations and pairs of simultaneous linear equations.

Create equations that describe numbers or relationships

Work with equal groups of objects to gain foundations for multiplication.

Work with addition and subtraction equations.

Analyze patterns and relationships.

Understand solving equations as a process of reasoning and explain the reasoning.

Represent and solve equations and inequalities graphically.

Use the four operations with whole numbers to solve problems.

Understand the relationship between zeros and factors of polynomials.

Use polynomial identities to solve problems.

Multiply and divide within 100.

Write expressions in equivalent forms to solve problems.

Solve equations and inequalities in one variable.

Reason about and solve one-variable equations and inequalities.

Understand and apply properties of operations and the relationship between addition and subtraction.

Represent and solve problems involving addition and subtraction.

Solve problems involving the four operations, and identify and explain patterns in arithmetic.

Understand addition as putting together and adding to, and understand subtraction as taking apart and taking from.

Solve systems of equations.

Apply and extend previous understandings of arithmetic to algebraic expressions.

Rewrite rational expressions.

Represent and analyze quantitative relationships between dependent and independent variables.

Represent and solve problems involving multiplication and division.

Work with radicals and integer exponents.

Use properties of operations to generate equivalent expressions.

Write and interpret numerical expressions.

Perform arithmetic operations on polynomials.

Interpret the structure of expressions.

Gain familiarity with factors and multiples.

Generate and analyze patterns.

Solve real-life and mathematical problems using numerical and algebraic expressions and equations.
problem_activity: Narrative
The purpose of this activity is for students to revist stage 2 of the Number Puzzles center which was first introduced in grade 1. Students work together to use digit cards to make addition and subtraction equations within 20 true. Each digit card may only be used one time on a page.
Required Materials
Materials to Copy
Number Puzzles Digit Cards
Number Puzzles Addition and Subtraction Stage 2 Gameboard
Required Preparation
Create one set of digit cards from the blackline master for each group of 2.
Launch
Groups of 2
Give each group a set of digit cards and game boards.
“We are going to play a game you may have played in first grade called Number Puzzles."
"In this game, you use digit cards to make each equation true. You can only use each digit card once on the game board.”
Activity
10 minutes: center work time
Activity Synthesis
Display Puzzle 1.
“Which equation would you start with? Why would you start there?”


correct_option_index: 1