Math
posted by Haley .
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
What did you find when you made the table?

Math 
Haley
Jump Number
Position After jump forward
Position after Step Back 
Math 
Haley
I don't have any idea.

Math 
Ms. Sue
Good.
According to your table, on which jump will she reach 20 feet? 
Math 
Haley
After 7 jumps foward and 6 backward.

Math 
Ms. Sue
Jump 1: 0 +5 2 = + 3
Jump 2: 3 + 5  2 = +6 
Math 
Haley
Thanks. Now I understand.

Math 
Ms. Sue
You're welcome.
Great! :)
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