It Takes Two to Tango

 Topic(s):

2nd Grade Addition

Images/Video Resources

Scenario

Watch the video to the right. In it they describe the branch system when adding two, two-digit numbers.

Compare that method with the way you do this type of addition. 

Isn't it great that there is more than one way to get the same results? This is a common occurrence in math.

Click on the following link...

https://docs.google.com/spreadsheet/ccc?key=0AtxgUWDsTRPFdGlONUI2eWVra3VTVUhObHVYMS13cUE

Play with the numbers and make general observations of what you are doing. Pay close attention as your observations can give you the answers for some of the upcoming questions and steps.

Task

Sample Investigations/Teacher Resources

Student Resources

Here are some cool websites for you to practice your addition skills.

http://www.funbrain.com/

http://www.abcya.com/

http://www.aplusmath.com/

http://chilimath.com/

http://www.math.com/

You can find some more if you go to:

http://www.kidsites.com/

Student Work

Standards (TEKS)

1. List your personal understanding, ideas or hunches.

 With your team use all the information available in the scenario to list everything that you know about adding two, two-digit numbers. You do not have to conduct any research yet. Just use the information given and write the facts that you already know about adding two, two-digit numbers.

With your team, make a list about what you do not know and would like to learn. List all the questions you will need to answer to solve the problem.  

5. List what needs to be done.
"What should we do?" List actions to be taken, e.g., question an expert, conduct research, go to a board meeting about topic. List possible actions. 

6. Develop a problem statement.

You will be responsible for thinking and choosing one of the questions to solve the problem.  A problem statement should come from your analysis of what you know. In one or two sentences, you should be able to describe what it is that your group is trying to solve, produce, respond to, or find out. The problem statement may have to be revised as new information is discovered and brought to bear on the situation.

Use all the resources available (Internet, library, etc) to research about the problem/topic and find a solution.

8. Present Findings

Students will create a Glogster Poster to present on a projector with their findings and whether or not they found a way to add two, two-digit numbers on their own.

2.3  Number, operation, and quantitative reasoning. The student adds and subtracts whole numbers to solve problems. 

The student is expected to: 

2.3B Model addition and subtraction of two-digit numbers, with objects, pictures, words, and numbers.  

2.3C Select addition or subtraction to solve problems using two-digit numbers, whether or not regrouping is necessary.

Communicating Ideas and Messages_2nd Grade by C. Gonzalez is licensed under a Creative Commons Attribution-NonCommercial-ShareAlike 3.0 Unported License.