options: Interpret the structure of expressions.

Gain familiarity with factors and multiples.

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

Use polynomial identities to solve problems.

Write expressions in equivalent forms to solve problems.

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

Solve systems of equations.

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

Multiply and divide within 100.

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

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

Add and subtract within 20.

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

Analyze patterns and relationships.

Perform arithmetic operations on polynomials.

Solve equations and inequalities in one variable.

Create equations that describe numbers or relationships

Work with radicals and integer exponents.

Apply and extend previous understandings of arithmetic to algebraic expressions.

Represent and solve equations and inequalities graphically.

Represent and analyze quantitative relationships between dependent and independent variables.

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

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

Understand the relationship between zeros and factors of polynomials.

Represent and solve problems involving multiplication and division.

Use properties of operations to generate equivalent expressions.

Generate and analyze patterns.

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

Reason about and solve one-variable equations and inequalities.

Use the four operations with whole numbers to solve problems.

Rewrite rational expressions.

Represent and solve problems involving addition and subtraction.

Write and interpret numerical expressions.

Work with addition and subtraction equations.
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: 11