1. Ecole Supérieure de Commerce de Neuchâtel Pierre Marchal
1MPES Add & Subtract on
Ecole Supérieure de Commerce de Neuchâtel
Pierre Marchal
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 Do the signs match ?
YES NO
Do the signs match ?
Subtract smaller number from larger one
Add the numbers
Keep the sign
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
1. Add numbers
2. Keep the sign
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  
Then apply the
subtraction
addition
adding
opposite
- 6 6
sign rule for addition

9. Examples of Application

10. Subtraction Exercises

11. PRACTICE EXERCISES

12. Exercises for the Addition

13. Exercises for the Subtraction

14. 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 for the next course, please learn your lesson!
Thanks for your ATTENTION