Subtracting Integers 8/23/16.

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Presentation transcript:

Subtracting Integers 8/23/16

Subtraction on the Number Line To subtract using the number line: Start at the first number. To subtract a positive -5 move left (towards negative 5 spaces) To subtract a negative – (-5) move right (towards positive 5 spaces) *When subtracting you are “taking away” To subtract a negative you want to take away negative and move positive!

Subtraction on the number line

Practice Subtraction on the Number line

Keep-Change-change Any subtraction problem can be written as an addition problem. Keep the first number the same. Change subtraction to addition. Change the second number to its opposite. *Now follow the rules for addition. Same Signs ADD the absolute value. Different Signs SUBTRACT the absolute value. Remember you could also use the number line or score board!

Subtracting Integers

Subtraction is Adding The opposite!

Practice Adding the Opposite (KCC) Problem Positives Negatives Answer 2 – 4 2 – (-4) -2 – 4 -2 – (-4) 6 – 8 -12 – 8 8 -15 -23 – (-12)

Practice w/ Number line or kcc