1. 1MPES2 Add & Subtract on Ecole Supérieure de Commerce de Neuchâtel Pierre Marchal 3.09.2015 http://creativecommons.org/licences/by/3.0/ Attribute to: Pierre Marchal (Lycée Jean-Piaget)

2. Objectives of the course By the end of the course, you should be able to: – Cite and apply the sign rules for adding – Cite and apply the trick for subtracting – Perform any type of addition & subtraction – Work comfortably with positive and negative numbers

3. Sign rule for adding YES NO Do the signs match ? Add the numbers Keep the sign Subtract smaller number from larger one Keep the sign of the larger number

4. EXAMPLES OF APPLICATION

5. Do the signs match ? YES, signs match: YES, signs match: 1. Add numbers 2. Keep the sign 1. Add numbers 2. Keep the sign

6. NO : signs do not match (1) 1. Subtract smaller number from larger one 2. Keep the sign of the larger number

7. NO : signs do not match (2) 1. Subtract smaller number from larger one 2. Keep the sign of the larger number

8. Sign rule for Subtracting Trick: Change the problem to an problem By the 6  - 6  Then apply the adding opposite - 6 6 subtraction addition sign rule for addition

9. EXAMPLES OF APPLICATION

10. Subtraction Exercises

11. PRACTICE EXERCISES

12. Exercises for the Addition

13. Exercises for the Subtraction

15. By the end of this course You are able to : – Cite and apply the sign rules for adding – Cite and apply the trick for subtracting – Perform any type of addition & subtraction – Work comfortably with positive and negative numbers

16. Any question ?

17. THANKS FOR YOUR ATTENTION See you on Monday, be ready for a test