Directed numbers

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Directed numbers

  1. 1. Directed Numbers Objective: Be able to add and subtract directed numbers.
  2. 2. First, you have to know the number line!  If you remember what the number line looks like you will find this easy! 8 7 6 5 4 3 2 1 -1 -2 -3 -4 -5 -6 -7 -8 -9 0
  3. 3. Let’s look at a question  Work out + 6 + - 3 What does this mean? The first part tells you where to start on the number line. The symbols tell you what to do. If they are the same, you add. If they are different, you subtract The last number tells you by how much.
  4. 4. Let’s do it + 6 + - 3 8 7 6 5 4 3 2 1 -1 -2 -3 -4 -5 -6 -7 -8 -9 0 Start here They are different, so subtract… … this much One! Two! Three! So there’s your answer, 3
  5. 5. + 6 + - 3 = 3
  6. 6. Here’s another … - 4 - - 9 8 7 6 5 4 3 2 1 -1 -2 -3 -4 -5 -6 -7 -8 -9 0 Start here They are the same, so we add… … this much So there’s your answer, 5
  7. 7. Here’s another … - 4 - - 9 8 7 6 5 4 3 2 1 -1 -2 -3 -4 -5 -6 -7 -8 -9 0 Start here They are the same, so we add… … this much So there’s your answer, 5

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