1. Interesting Integers! Let’s subtract.

2. What You Will Learn Rules for subtracting Method for subtracting Are you ready??

3. We will use algebra tiles to solve some subtraction problems Remember zero pairs – 1 set of opposite colors will be a zero pair Red is positive Yellow is negative 1 yellow + 1 red = 0

4. Let’s try a problem -2 - 4 = This is our zero pair bank

5. Problem: 4 - 2

6. -2 - 4 = Remove 4 red (positive)

7. Problem: 5 - -2

8. Problem: -3 - -4 =

9. Subtracting Integers To subtract integers, add its opposite! 2 – 7 2 + (-7) Follow the add rules

10. Here are some examples 5 – (+5) 5+ (-5) = 0 5 – (+10) 5 + (-10) = -5

11. Integer Subtraction Rule Subtracting a negative number is the same as adding a positive. Change the signs and add. 2 – (-7) is the same as 2 + (+7) 2 + 7 = 9!

12. Here are some more examples. 12 – (-8) 12 + (+8) 12 + 8 = 20 -3 – (-11) -3 + (+11) -3 + 11 = 8

13. 2 – (+7)= 4 – (-5) = -10 – (-6) = -21 – (+63) = 7-2=5 4 +5 = 9 -10 + 6 = -4 63 – 21 = 42 Forget the sign, find the difference, use the sign of the larger

14. Try these 1. 8 – (-12) = 2. 22 – (-30) = 3. – 17 – (-3) = 4. –52 – 5 =

15. 8 – (-12) = 8 + 12 = 20 2. 22 – (-30) = 22 + 30 = 52 3. – 17 – (-3) = -17 + 3 = -14 4. –52 – 5 = -52 + (-5) = -57

16. Homework – page 268/269 16 through 28 all

17. Formative Order least to greatest -10 0 8 -14 22 -1.2 1.3 Solve -15 + 8 = -4 - -4 = 5 + -3 = -4 - +6 =

18. Homework Based on formative results-from textbook Ordering and comparing – pg 24 #1, #2 Adding pg 27 #5, #6, #7, #8 Subtracting pg 28 #1 #2 #3 #4