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Transcript

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