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5
© 1998 T
EXAS
I
NSTRUMENTS
I
NCORPORATED
Activity 2
Dice Digits
Students use 4 numbers, any operations, and grouping
symbols to write mathematical expressions that are
equal to each of the numbers 1 through 9.
Number Sense
♦
order of operations
♦
mental math
♦
basic computation
Materials
♦
student activity sheet (provided)
♦
transparency of activity sheet
♦
TI-73
³
Setup
If your TI-73s have not been used for random number
generation prior to this activity, you and your students
need to store an integer “seed value” to
rand
in each TI-73.
With each
rand
execution, the TI-73 generates the same
random-number sequence for a given seed value. The
TI-73 factory-set seed value for
rand
is
0
. To generate a
different random-number sequence, store any non-zero
seed value to
rand
.
➪
If you do not enter a seed
value,
rand
uses whatever
value happens to be the
current seed. If there is no
seed, it uses the factory-
set value of
0
.
1. Enter the number you want for your seed value. Have
students use different seed values. (In the example
shown at the right,
1
is used.)
2. Now press X 1 " "
1
b
1 " "
1
b b.
(For more information about seed values, refer to the
“1 Probability Menu” section in the Math chapter of
the TI-73 Guidebook .)
➪
If you want to restore the
factory-set seed value,
store
0
to
rand
or reset
the defaults.