Numbers - Week 37 - Lesson 4 - Adding and Subtracting Negative and Positive Numbers Continued.
Objective: Students will be able to add and subtract negative and positive integers.
In this lesson we will review how to add/subtract positive and negative integers and start to include more details such as when we add or subtract positive and negative numbers with double sign.
Adding and subtracting with a double sign means...
+ - = -
- + = -
+ + = +
- - - = +
Have the students copy this in their notebooks and ask if they notice any patterns.
When you have two of the same signs they make a positive
When you have two different signs they make a negative.
Examples:
3 + ( - 5)
- 4 - ( - 6 )
9 - ( + 4 )
12 - ( - 7)
10 - ( -3 + 8)
More examples and practice can be found on this document.