1. Subtracting INTEGERS

2. Strategy: Using Integer Chips

3. Subtracting With Integer Chips With a partner … Take a look at the examples on pg. 356 and try to self-learn how to subtract with integer chips Take a look at the examples on pg. 356 and try to self-learn how to subtract with integer chips Sample this strategy by creating your own subtraction question and solve using the integer chips in front of you. Sample this strategy by creating your own subtraction question and solve using the integer chips in front of you. Hint: Take away zero Hint: Take away zeromodels?? How do you do this?

4. Subtracting With Integer Chips Now try subtracting the following using integer chips. Draw your solution and write the equation. a)5 – 9 = _____ b)-5 – (-1) = _____ c)6 – (-3) = _____

5. Strategy: Using Number Lines

6. Subtracting with Number Lines With a partner … Try to self-learn how to use number lines to subtract integers. Solve the question provided using the number line. Try to self-learn how to use number lines to subtract integers. Solve the question provided using the number line. Hints: -Use the integer chip strategy to get an answer so you can compare with your number line answer. Hints: -Use the integer chip strategy to get an answer so you can compare with your number line answer. -Try using the second integer first?

7. Subtracting Integers Number Lines How do you subtract integers using a number line? -2 – 5 = ________ -2 – 5 = ________ a) Start with the second integer (+5) and mark it off on the number line b) Mark off the first integer (-2) c) The difference between the two is your answer. The direction along the number line determines the sign (left (-), right (+))

8. Subtracting Integers Integer Chips & Number Lines Now try these questions using number lines to solve. a)3 – 7 = _____ b)3 – (-2) = _____ c)-4 – (-2) = _____

9. Strategy: Solving Mentally (Rules)

10. Subtracting Integers Using Rules to Solve With a partner, take a look at these examples. What is happening? Can you come up with a rule? a) 3 – (-2) = 3 + 2 = 5 b) -4 – (-2) = -4 + 2 = -2 c) -3 – 5 = -3 + (-5) = -8 d) 2 – 7 = 2 + (-7) = -5

11. Subtracting Integers Using Rules to Solve Subtraction of integers can be done mentally by adding the opposite integer. Then use the rules for adding integers. Now try the same questions as before, but using the rules to solve (show your work). a)3 – 7 = _____ b)3 – (-2) = _____ c)-4 – (-2) = _____