Posted by **Haley** on Tuesday, March 1, 2011 at 6:42pm.

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.

- Math -
**Ms. Sue**, Tuesday, March 1, 2011 at 6:44pm
What did you find when you made the table?

- Math -
**Haley**, Tuesday, March 1, 2011 at 6:47pm
Jump Number

Position After jump forward

Position after Step Back

- Math -
**Haley**, Tuesday, March 1, 2011 at 6:53pm
I don't have any idea.

- Math -
**Ms. Sue**, Tuesday, March 1, 2011 at 6:54pm
Good.

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

- Math -
**Haley**, Tuesday, March 1, 2011 at 6:56pm
After 7 jumps foward and 6 backward.

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**Ms. Sue**, Tuesday, March 1, 2011 at 6:58pm
Jump 1: 0 +5 -2 = + 3

Jump 2: 3 + 5 - 2 = +6

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**Haley**, Tuesday, March 1, 2011 at 7:02pm
Thanks. Now I understand.

- Math -
**Ms. Sue**, Tuesday, March 1, 2011 at 7:10pm
You're welcome.

Great! :-)

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