1 Math Subtract Integers. 2 What Are You Learning? I CAN subtract integers.

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Presentation transcript:

1 Math Subtract Integers

2 What Are You Learning? I CAN subtract integers.

3 Why Do You Need To Know This? Subtracting integers is useful because it helps in solving real world problems.

4 Subtract Integers To subtract an integer, add its opposite. LEAVE – CHANGE - OPPOSITE 4 – 9 = 4 + (-9) = -5 2 – 5 = 2 + (-5) = -3 2 – (-5) = = 7

5 a) 1 – 5 b) -2 – 1 c) -3 – 4 d) 0 – 5 Subtracting Integers – use a number line to double check your work!

6 Subtracting Positive Integers a. 8 – 13 b. -10 – 7 c. 2 – 15

7 -3 –

8 Subtracting Negative Integers Remember – add the opposite! Change subtraction to addition, then change the sign of the second number. a. 1 – (-2) b. -10 – (-7) c. 4 – (-12) d. -15 – (-5)

9 29 – (-24)

– (-8)

11 Complete the following problems. a. -13 – 8 b. 12 – (-6) c. 21 – (-8)

12 Complete the following problems. a. 32 – (-3) b. -40 – 66 c. 2 – 48 d. -7 – (-5) e. -24 – (-5) f. 19 – (-4) g. -33 – 11 h. 14 – 46 i – 50 – (-10)

13 Complete the following problems. a. -6 – (-2) b (-2) c. -4 – (-3) d. -8 – (-5) e. 4 – 8 f. -1 – 5 g. -2 – (-7) h. In January 1916 the temperature in Browning, Montana, fell 100 degrees overnight. The initial temperature was 44ºF. What was the final temperature?

Simplifying expressions with integers… 6 + (-5) – 3 15 – 12 – 8 1 – 8 + (-6) 4 – (-7) – 9 -2 – 5 – (-10) 14

15 Class Work Complete first two columns on E-61 worksheet If you get done early…continue working on the other two columns.