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Subtracting Integers
Subtracting Integers
Subtracting Integers
Subtracting Integers
Subtracting Integers
Subtracting Integers
Subtracting Integers
Subtracting Integers
Subtracting Integers
Subtracting Integers
Subtracting Integers
Subtracting Integers
Subtracting Integers
Subtracting Integers
Subtracting Integers
Subtracting Integers
Subtracting Integers
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Subtracting Integers

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Transcript

  • 1. On a chip board
  • 2. So let’s subtract -5 - -3 Put on 5 red chipsSince we’re subtracting, weneed to take chips OFF the board Take off 3 red chips (in order to subtract - 3) So, -5 - -3 =-2
  • 3. Now let’s subtract -3 - -5 Put on 3 red chipsHow can we subtract 5 redchips when we only have 3? ADD TWO ZERO PAIRS! Now you can take off the five red chips. -3 - -5 = 2
  • 4. Remember, one positiveand one negative make a ZERO PAIR
  • 5. Say you wanted to show “+5” on a chip board. You could just use 5 yellow chipsor 5 yellow chips and a zero pairor 5 yellow chips and 2 zero pairs This is very important for subtraction!
  • 6. Now let’s subtract 2 - 3 Put on 2 yellow chipsHow can we take away 3yellow chips when we only have 2? How many zero pairs do we need? Now you can take away 3 yellow chips. 2 - 3 = -1
  • 7. Try subtracting -4 - -6 What should we do first?Do we have enough to subtract -6? No, so how many zeropairs do we need to add?Now, what do we take away? -4 - -6 = 2
  • 8. Let’s try 5 - -3 What should we do first? Do we have enough to subtract -3?We need to take off 3 red chips, and we don’t have ANY! So, how many zero pairs do we need to add? Now, what do we take away? 5- -3 = 8
  • 9. Let’s try one more 5 - 7 What should we do first?Do we have enough to subtract 7? No, so how many zeropairs do we need to add?Now, what do we take away? 5 - 7 = -2
  • 10. 1. Solve 5 – 3Explain in words:2. Solve -5 – (-3)Explain in words:
  • 11. 3. Solve -5 – 3Explain in words:1. Start with -52. Add 3 zero pairs3. Remove 3 positives
  • 12. 4. Solve 5 – (-3)Explain in words:5. Solve -4 – (-7)Explain in words:
  • 13. 6. Solve -3 – (-4)Explain in words:7. Write the subtractionproblem that is modeledin the box. + + + + +
  • 14. 1. What does it mean to add a “zero pair”?2. Does adding a “zero pair” change the difference?
  • 15. -14 -13 -12 -11 -10 -9 -8 -7 -6 -5 -4 -3 -2 -1 0 11. Model on the number line and solve. -4 – 3 = -9 -8 -7 -6 -5 -4 -3 -2 -1 0 1 2 3 4 5 6 2. Model on the number line and solve. 6 – 8 =
  • 16. Rules for adding integers:• Same signs – ADD and keep the sign.• Different signs – SUBTRACT and take the sign from the number that “has more” (or is bigger in absolute value.
  • 17. Rules for subtracting integers:SUBTRACTION IS ICKY! So:1. Keep the first number the same.2. Change the subtraction sign to addition.3. Make the second number its opposite.4. Use the addition rules. Keep it! Change it! Opposite it!

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