Two digit addition and subtraction
This presentation is the property of its rightful owner.
Sponsored Links
1 / 29

Two-Digit Addition and Subtraction PowerPoint PPT Presentation


  • 56 Views
  • Uploaded on
  • Presentation posted in: General

Two-Digit Addition and Subtraction. Time to assess kids will be inserted when we know what time that will occur!. Solve the following problem: 28 + 16 = ?. Without paper and pencil (please)

Download Presentation

Two-Digit Addition and Subtraction

An Image/Link below is provided (as is) to download presentation

Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author.While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server.


- - - - - - - - - - - - - - - - - - - - - - - - - - E N D - - - - - - - - - - - - - - - - - - - - - - - - - -

Presentation Transcript


Two digit addition and subtraction

Two-Digit Addition and Subtraction

Time to assess kids will be inserted when we know what time that will occur!


Solve the following problem 28 16

Solve the following problem:28 + 16 = ?

  • Without paper and pencil (please)

  • After you solve the problem, find a partner and show them how you solved the problem using the cubes as a model


Solve the following problem 28 161

Solve the following problem:28 + 16 = ?

  • 38 +16 =

  • 58 +16 =

  • 28 +26 =

  • 28 + 66=

  • 48 +36 =


Connect

Connect

How do these tasks connect to the Grouping Tens videos?


Discussing the video

Discussing the Video

  • Video for 69+87

  • What did you notice?

  • What is the connection to the work that we have been doing?


Reading about 2 digit addition

Reading about 2-digit addition

  • Read p. 102-105 in the red book

  • What is the connection between place value understanding and addition work?

  • What mathematical understandings do students need to have in place to be successful?


Two digit addition and subtraction assessment

Two-Digit Addition and Subtraction Assessment

  • Can the student use the concept of tens and ones to add two-digit numbers, by mentally breaking them apart and reorganizing them into the total numbers of tens and ones, when the problem is present:

    • Level 1: With a model

    • Level 2: Without a model

    • Level 3: Symbolically


Activities

Activities

Containers

Building Stacks

Roll and Add


Let s watch cooper

Let’s watch Cooper!


What would cooper need now

What would Cooper need now?


Let s try the two digit addition and subtraction assessment

Let’s try the Two-Digit Addition and Subtraction Assessment

  • Log into amcanywhere.com

  • Complete the assessment as we watch Brian


Let s assess brian

Let’s Assess Brian


Two digit addition and subtraction

Brian

What did he score?

What evidence was there about his mathematical understanding?

What questions do you have about Brian’s understanding?


What comes next for brian

What comes nextfor Brian?

  • Using the blue book, read p. 214-215

  • Using the charts on p. 215-217

  • Can you find which activities Brian needs at this point?


Two digit addition and subtraction

  • Now find Roll and Add in your Developing Number Concept Books


Station time

Station Time!

Add ‘Em Up - Lots of Lines

Partner Add-It

Add ‘Em up- Yarn Shapes


Time for lunch

Time for lunch

11:30-12:45


Time for math

Time for math

52-24=

Now we want you to come up with 6 related subtraction problems.

Two of them should include the number 52.

Two of them should include the number 24.

Two of them should include neither 52 or 24.


Reading subtraction

Reading- Subtraction

  • Read p. 106-107

    “Subtracting Numbers to 100”


Your turn

Your turn…..

Read your assigned strategy.

Be prepared to share with the group:

1. What is the strategy?

2. Show an example

3. How does it relate to the assessment?


Subtraction specific games

Subtraction specific games…

Roll and Subtract

Two Ten Shapes Subtraction

Partner Take Away


Agree disagree

agree/disagree…

By the end of 2nd grade students need to have basic facts memorized (2 seconds or less).

By the end of 2nd grade students need to have multiple strategies and ways to think about subtracting 2-digit numbers.

By the end of 2nd grade students need to be proficient with the standard algorithm for subtraction.

By the end of 2nd grade, getting the answer to a 2-digit addition or subtraction problem efficiently (in a few quick steps) is a reasonable expectation.


Connections to investigations

Connections to Investigations

What are the addition/subtraction strategies that students typically work with in 2nd grade?

How can this last assessment and the concepts in it support students’ strategies?


Moving forward

Moving Forward

Assess your students….

  • Grant requires- Hiding Assessment 3 times

    By Oct 15, By Jan 30, By May 30

  • Other assessments based on students’ needs

    Complete online modules

  • Due dates- Oct 15, Jan 30, April 30

  • On-line modules are all classroom-based and based on collecting data


Two digit addition and subtraction

Survey on experience...

Thank you for taking the time to complete this

We need to report to NCDPI about your experience.


Be awesome

Be Awesome!!!

To teachers


  • Login