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# How Addition And Subtraction Work

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ED 205 Powerpoint Project for Lower Elem. on how addition and subtraction work.

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### How Addition And Subtraction Work

1. 1. HOW ADDITION AND SUBTRACTION WORK Allison Staley ED 205-06
2. 2. ADDITION AND SUBTRACTION <ul><li>How Addition Works </li></ul><ul><li>Putting Sets Together (Addition) </li></ul><ul><li>How Subtraction Works </li></ul><ul><li>Taking It Away (Subtraction) </li></ul><ul><li>Video on Addition and Subtraction </li></ul><ul><li>About the Author </li></ul><ul><li>Resources </li></ul><ul><li>Concept Map </li></ul>Quit
3. 3. ADDITION: First, look at the two sets: Set A Set B Count how many triangles are in each set. Click here to see the answers! Quit
4. 4. PUTTING SETS TOGETHER: <ul><li>Set A Set B </li></ul><ul><li>Adding the two sets together will give us how many triangles? </li></ul>Click here to see the answers! Quit
5. 5. SUBTRACTION: <ul><li>Look at this set: </li></ul><ul><li>Count how many triangles are in this set. </li></ul>Click here to see the answers! Quit
6. 6. TAKING IT AWAY: <ul><li>Now take away two triangles: </li></ul><ul><li>How many triangles are left? </li></ul>Click here to see the answers! Quit
7. 7. ADDITION & SUBTRACTION Quit
8. 8. ABOUT THE AUTHOR: <ul><li>My name is Allison Staley. </li></ul><ul><li>I’m a student at Grand Valley State University. </li></ul><ul><li>I’m majoring in Mathematics with an Elementary Education Minor. </li></ul><ul><li>I am a huge fan of the Tigers and the Red Wings! </li></ul>Email me: [email_address] Quit
9. 9. RESOURCES <ul><li>United Streaming </li></ul><ul><li>http://player.discoveryeducation.com/index.cfm?guidAssetId=7EC1A971-834F-47C3-BB9F-740892BF1182&blnFromSearch=1&productcode=US </li></ul><ul><li>Cool Math 4 Kids </li></ul><ul><li>http://www.coolmath4kids.com </li></ul>Quit
10. 10. CONCEPT MAP: Quit
11. 11. Set A Set B There are 2 There are 3 Quit Return
12. 12. It will give us 5. So 2 + 3 = 5 Quit Return
13. 13. There are 5 triangles. Quit Return
14. 14. There are 3 triangles left. So 5 – 2 = 3 Quit Return