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© 1998 T
EXAS
I
NSTRUMENTS
I
NCORPORATED
Activity 5
The Twin’s Towers
Students develop the concept of a variable while solving
problems using the b
key and the -
¢
key.
Patterns and Functions
♦
problem solving
♦
percents
♦
adding fractions
Materials
♦
blocks or cutouts
♦
student activity sheet (provided)
♦
TI-73
³
Setup
Discuss the following situation with your class.
My twin brother and sister are building towers with
blocks. They built them in the following ways.
1-level tower
2-level tower
3-level tower
The twins want to know how many blocks they will need
for a tower 27 levels high. Can you help them find this?
No. of levels
1
2
3
4
5 . . . . . . 27
No. of blocks
3
4
5
6
7 . . . . . . 29
➪
Build the towers with
blocks as you discuss this
activity or have the
students build them with
you.