Subtracting Integers Objective Learn to subtract integers When
Subtracting Integers Objective: 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: �Again we will -6 -7= 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 = follows: �So you must change it as 6 + (-15)= 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 =
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 1. + + + = add (+) 2. - + - = add ( - ) 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.
- Slides: 6