Reflection: Developing a Conceptual Understanding Using Mental Math to Add and Subtract - Section 1: Opener

 

The lesson made the students really think.  It is hard for some students to work on a skill without writing it down.  I feel that if the students can do it in their heads, then it will make it easier for them to work problems with pencil and paper.  

My rationale for not letting them use pencil and paper at all was because I felt like it gave the lesson a twist.  It gained the students attention.  It turned the lesson into a challenge.  I know that mental math means doing it in your head, but it could have easily been done with paper and pencil.  It would have been easier for me to see how the students were thinking if I had them put it down on paper.  I chose not to do this.  

From their oral responses and dry erase board response, I gained enough insight on the students' level of understanding.

  Mental Math
  Developing a Conceptual Understanding: Mental Math
Loading resource...
 

Using Mental Math to Add and Subtract

Unit 11: Adding and Subtracting Whole Numbers
Lesson 1 of 11

Objective: SWBAT apply a variety of methods (such as breaking apart, compensation, and counting on) to add and subtract whole numbers mentally.

Big Idea: Students can use the break apart, compensation, and counting on methods to add and subtract without paper and pencil.

  Print Lesson
10 teachers like this lesson
Subject(s):
Math, Number Sense and Operations, add and subtract whole numbers, Operations
  60 minutes
using mental
 
1
2
3
4
5
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.
  Favorites(9)
  Resources(14)
Helena, MT
Environment: Suburban
Melissa Romano
 
Dog Pen Problem Solving
4th Grade Math » Area & Perimeter
Big Idea: Students will focus on providing a precise model, precise work, a precise equation, and an accurate answer as they solve area and perimeter word problems.
  Favorites(5)
  Resources(23)
MT
Environment: Urban
Kara Nelson
 
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!
  Favorites(7)
  Resources(18)
Seattle, WA
Environment: Urban
James Ewing
 
 
Something went wrong. See details for more info
Nothing to upload
details
close