Math

Barbara is playing a game. She jumps forward 5 feet, and then steps backward 2 feet. How many jumps will it take her to reach the finish line, which is 20 feet from where she started?

Make a table to show Barbara's position.

Barbara will reach 20 feet on jump number _____?

It will take Barbara ______ jumps forward before she passes the finish line.

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  1. What did you find when you made the table?

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    Ms. Sue
  2. Jump Number
    Position After jump forward
    Position after Step Back

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  3. I don't have any idea.

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  4. Good.

    According to your table, on which jump will she reach 20 feet?

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    Ms. Sue
  5. After 7 jumps foward and 6 backward.

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  6. Jump 1: 0 +5 -2 = + 3
    Jump 2: 3 + 5 - 2 = +6

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    Ms. Sue
  7. Thanks. Now I understand.

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  8. You're welcome.

    Great! :-)

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    Ms. Sue

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