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
Loading resource...

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.

  Print Lesson
2 teachers like this lesson
Similar Lessons
Subtracting with Decomposing
4th Grade Math » Place value
Big Idea: In this lesson, students use tape diagrams in order to subtract and make sense of subtraction as the inverse of addition.
Helena, MT
Environment: Suburban
Melissa Romano
Using Mental Math to Add and Subtract
4th Grade Math » Adding and Subtracting Whole Numbers
Big Idea: Students can use the break apart, compensation, and counting on methods to add and subtract without paper and pencil.
Memphis, TN
Environment: Urban
Rose Monroe
Real World Word Problems with Multiplication and Division (Day 2)
5th Grade Math » Multi-Digit Multiplication and Division, Powers of 10s
Big Idea: Order of Operations is essential to all math work, leading to understanding of Algebraic expressions. Many Real World Problems take more than one step to solve, sometimes 2 steps and sometimes more steps!
Seattle, WA
Environment: Urban
James Ewing
Something went wrong. See details for more info
Nothing to upload