Reflection: Checks for Understanding Decomposing to Compare Daily Salaries - Section 3: Student Practice


Here are two examples of students completing the algorithm and then checking their work using decomposition: Noticing Patterns While Adding and Decomposing to Subtract. I loved listening to students explain why two problems equaled the same sum (50+72 =53+69).

Overall, the majority of students were quite successful. Most students finished all problems within this time frame. The best part of this lesson was watching students truly think through the processes of addition and subtraction using their understanding of place value.

  Checks for Understanding: Reflection
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Decomposing to Compare Daily Salaries

Unit 5: Adding & Subtracting Large Numbers
Lesson 9 of 16

Objective: SWBAT check addition and subtraction algorithms using decomposition.

Big Idea: Students will use the expanded form of numbers to compare salaries.

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