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

Rewrite rational expressions.

Work with addition and subtraction equations.

Work with radicals and integer exponents.

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

Interpret the structure of expressions.

Write expressions in equivalent forms to solve problems.

Use properties of operations to generate equivalent expressions.

Gain familiarity with factors and multiples.

Reason about and solve one-variable equations and inequalities.

Generate and analyze patterns.

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

Analyze patterns and relationships.

Represent and solve problems involving multiplication and division.

Use polynomial identities to solve problems.

Perform arithmetic operations on polynomials.

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

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

Multiply and divide within 100.

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

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

Solve systems of equations.

Add and subtract within 20.

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

Write and interpret numerical expressions.

Solve equations and inequalities in one variable.

Create equations that describe numbers or relationships

Represent and solve problems involving addition and subtraction.

Use the four operations with whole numbers to solve problems.

Represent and solve equations and inequalities graphically.

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

Understand the relationship between zeros and factors of polynomials.

Apply and extend previous understandings of arithmetic to algebraic expressions.

Represent and analyze quantitative relationships between dependent and independent variables.
problem_activity: Narrative
The purpose of this Number Talk is to elicit strategies and understandings students have for subtracting. The expressions are explicitly chosen to encourage students to use their understanding of the 10 + n structure of teen numbers to subtract (MP7). This method will be discussed in more depth is this lesson's activities.
Launch
Display one expression.
“Give me a signal when you have an answer and can explain how you got it.”
1 minute: quiet think time
Activity
Record answers and strategy.
Keep expressions and work displayed.
Repeat with each expression.
Student Facing
Find the value of each expression mentally.
\(17 - 7\)
\(17 - 7 - 1\)
\(17 - 8\)
\(17 - 9\)
Student Response
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Activity Synthesis
“Did anyone approach the problem in a different way?”


correct_option_index: 22