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Integer Addition & Subtraction

Integer Addition & Subtraction. Using pegs and holes…. Setting it all up. We are going to look at adding ad subtracting integers using pegs and holes. A peg represents +1 A hole represents -1 So 5 pegs would be +5 and 3 holes would be -3

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Integer Addition & Subtraction

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  1. Integer Addition & Subtraction Using pegs and holes…

  2. Setting it all up We are going to look at adding ad subtracting integers using pegs and holes. A peg represents +1 A hole represents -1 So 5 pegs would be +5 and 3 holes would be -3 If a peg is put in a hole then you are left with neither a peg nor a hole, which is equivalent to zero. + = 0

  3. Adding pegs and holes… Adding pegs and holes to the starting situation is straight forward. EG + = = 1 + =

  4. Subtracting pegs and holes… This requires a little more thought… to take away a hole you need to add a peg (to fill it up) and to take away a peg you need to add a hole (for it to fall into). EG - = + =

  5. Subtracting pegs and holes… EG - = + = =3

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