I can use a number line to model addition and subtraction of rational numbers. 

I can use properties of operations to add and subtract rational numbers. 

MATHEMATICS OBJECTIVE

Students will be able to:

- add and subtract positive and negative rational numbers.

- use number lines to model addition and subtraction as a movement or distance between rational numbers.

ESSENTIAL UNDERSTANDING

Adding and subtracting integers is related to adding and subtracting other rational numbers.

The rules for adding and subtracting all rational numbers are the same as those for adding and subtracting integers.

The distance between any two rational numbers p and q on a number line is the absolute value of their difference.

The distance between p and q can be written as |p - q| or |q - p|.

[Number line: p = -5, q = -2, distance 3.]

|-5 - (-2)| = |-2 - (-5)| = 3