standard_description: Explain why addition and subtraction strategies work, using place value and the properties of operations. (Explanations may be supported by drawings or objects.)
problem_activity: Narrative
The purpose of this Choral Count is for students to practice counting on by 5 and to notice patterns in the count. These understandings help students develop fluency and will be helpful later in this lesson and future lessons when students show their thinking when finding total values of sets of coins.
Launch
“Count by 5, starting at 15.”
Record in a single row as students count.
Stop counting and recording at 85.
“Count by 5, starting at 40.”
Record in a single row directly below the first count as students count. Put 40 directly below 20, so that the fives and zeros in the ones place of each number are aligned.
Stop counting and recording at 100.
Activity
“What patterns do you see?”
1
–
2 minutes: quiet think time
Record responses.
Student Response
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Activity Synthesis
“Who can restate the pattern in different words?”
“Does anyone want to add an observation as to why that pattern is happening here?”


aligns: no