Subtracting Integers

Subtracting Integers
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  • As there are rules for addition, there are rules for subtraction! The most common rule is add a line and change the sign, or Keep, Change, Change. What you do is you keep your first number the same, you change the subtraction sign to an addition sign, and change the last number's value to the opposite value. With this information, what is the answer to this question?
  • 25 - (-14) = x
  • The answer is 39 because Keep Change Change makes the equation 25 + 14 = 39
  • (-5) - 12 = d
  • Great job! The next equation is on the board. Who can answer it?
  • The answer is -17 because Keep Change Change  causes the equation to be  (-5) + (-14) = -17
  • (-27) - (-43) = r
  • Great job! The next equation is on the board. Who can answer it?
  • The answer is 70 because Keep Change Change makes the equatiom (-27) + 43 = 16
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