options: Use properties of operations to generate equivalent expressions.

Reason about and solve one-variable equations and inequalities.

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

Add and subtract within 20.

Represent and solve problems involving addition and subtraction.

Generate and analyze patterns.

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

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

Solve equations and inequalities in one variable.

Rewrite rational expressions.

Interpret the structure of expressions.

Solve real-life and mathematical problems using numerical and algebraic expressions and equations.

Represent and solve problems involving multiplication and division.

Create equations that describe numbers or relationships

Solve systems of equations.

Represent and analyze quantitative relationships between dependent and independent variables.

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

Represent and solve equations and inequalities graphically.

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

Apply and extend previous understandings of arithmetic to algebraic expressions.

Understand the relationship between zeros and factors of polynomials.

Analyze patterns and relationships.

Work with radicals and integer exponents.

Use polynomial identities to solve problems.

Multiply and divide within 100.

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

Use the four operations with whole numbers to solve problems.

Write and interpret numerical expressions.

Perform arithmetic operations on polynomials.

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

Write expressions in equivalent forms to solve problems.

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

Work with addition and subtraction equations.

Gain familiarity with factors and multiples.
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: 3