options: Extend the counting sequence.

Understand the place value system.

Understand place value.

Use place value understanding and properties of operations to perform multi-digit arithmetic. (A range of algorithms may be used.)

Use place value understanding and properties of operations to add and subtract.

Work with numbers 11–19 to gain foundations for place value.

Perform operations with multi-digit whole numbers and with decimals to hundredths.

Use place value understanding and properties of operations to perform multi-digit arithmetic.
Grade 4 expectations in this domain are limited to whole numbers less than or equal to 1,000,000.

Generalize place value understanding for multi-digit whole numbers.
Grade 4 expectations in this domain are limited to whole numbers less than or equal to 1,000,000.
problem_activity: Narrative
The purpose of this Number Talk is to elicit strategies and understandings students have for adding within 100. These understandings help students develop fluency and will be helpful later in this lesson when students add two-digit numbers using methods based on place value.
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.
\(13 + 21\)
\(13 + 31\)
\(23 + 31\)
\(33 + 41\)
Student Response
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Activity Synthesis
“How can
\(23 + 31\)
help you solve
\(33 + 41\)
?” (The tens are changing again. In
\(33 + 41\)
, you are adding 2 tens total, so the sum of
\(23 + 31\)
increases by 20.
\(54 + 20 = 74\)
.)


correct_option_index: 4