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How to subtract integers. Why change to addition problem  Subtraction is the opposite of addition  So we make things opposite.

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Presentation on theme: "How to subtract integers. Why change to addition problem  Subtraction is the opposite of addition  So we make things opposite."— Presentation transcript:

1 How to subtract integers

2 Why change to addition problem  Subtraction is the opposite of addition  So we make things opposite

3 Step 1  Only make things opposite after the subtraction  Example -4 – 9 would read negative four subtract negative nine So, we only change subtract negative nine

4 Step 2  How do we change them  We know that taking away a negative thing is a positive situation  So, -(-3) will be + (+3)  We changed subtraction to adding and negative to positive

5 You try  Only change them to addition problems 6- (-5) 6 +(+5) -10-(-4) -10 +(+4)

6 Other type  When we take way a positive thing  We know it is a negative situation  So 7 – 19 we change subtraction to addition and positive 19 to -19

7 You try  Only change to addition problem (-10) (-20)

8 Now we have addition problem  Follow the same steps when we added integers  What do we have more of  Answer will be that sign  Signs same or different  Same add, different subtract

9 You try whole process –(-6) -3 +(6) more positive signs different, subtract -3 +(6)= (-11) More negatives Signs same, add -7+(-11)=-18


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