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

Gain familiarity with factors and multiples.

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

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.

Use the four operations with whole numbers to solve problems.

Represent and analyze quantitative relationships between dependent and independent variables.

Multiply and divide within 100.

Write and interpret numerical expressions.

Create equations that describe numbers or relationships

Perform arithmetic operations on polynomials.

Represent and solve problems involving addition and subtraction.

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

Interpret the structure of expressions.

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

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

Use properties of operations to generate equivalent expressions.

Solve systems of equations.

Understand the relationship between zeros and factors of polynomials.

Use polynomial identities to solve problems.

Analyze patterns and relationships.

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

Apply and extend previous understandings of arithmetic to algebraic expressions.

Rewrite rational expressions.

Work with addition and subtraction equations.

Work with radicals and integer exponents.

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

Add and subtract within 20.

Represent and solve problems involving multiplication and division.

Generate and analyze patterns.

Write expressions in equivalent forms to solve problems.

Reason about and solve one-variable equations and inequalities.

Represent and solve equations and inequalities graphically.

Solve equations and inequalities in one variable.
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: 27