Aim: I will learn to subtract integers. Subtracting Integers Aim: I will learn to subtract integers.

When subtracting integers: When you have two negative numbers shown like this: -7 – 8 You have to follow the addition rules as if they were two negative numbers and change as follows: -7 + (-8) = -15 For example: - 6 - 7 = Again we will follow the addition rules and change it as follows… -6 + (-7)= -13 Example: – 10 – 7 =

Another way you might see subtracting integers is as follows… Ex. 6 - 15 = you must change it as follows: 6 + (-15)= So you have a positive and a negative number. Follow the addition rules: When adding a positive and negative number you must SUBTRACT and the answer takes the sign of the larger number. So the answer is – 9 Your example: 12 – 26 =

For example: 1 – (– 2) = When you subtract a negative number… Watch out! Whenever you see 2 negative signs together, you must turn them both into positives! For Ex. - (- a ) = + a When you subtract a negative number… For example: 1 – (– 2) = You must change the subtraction to an addition and the negative to a positive… Like this: 1 + (+2) = 3 Example 1: 4 – (- 19) = Example 2: - 11 – (- 42) =

Summary Adding and Subtracting Integers 3. - + + or + + - = subtract and… the answer takes the sign of the larger number. 4.When you see 2 negative signs together, with no number in the middle….you must turn them BOTH into positive!! - (- ) + (+ )

Homework: Solve: follow the adding and subtracting integer rules.