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10
Using the TI-73: A Guide for Teachers
Number Sense
© 1998 T
EXAS
I
NSTRUMENTS
I
NCORPORATED
1. Measure the strings.
2. Enter the data in
L
1
on the TI-73.
a. Display the List editor.
3
b. If necessary, clear
L
1
.
$ to highlight
L
1
: b
c. Starting at the first line in
L
1
, enter the string
lengths. (You’ll get an error if
L
1
is still highlighted.)
Press b after each list item.
3. Find the mean of
L
1
.
a. Return to the Home screen.
- l
b. Access the - v
MATH
menu and select
mean
.
- v " " [
c. Calculate the mean of
L
1
.
- v Y E b
4. Inform students that the average small intestine is 6m
(20 ft.) long. Ask:
Was the mean you found close to 6m (20 ft.)?
Who had the closest estimate?
Which estimate was off the farthest?
What are some objects that are 6m (20 ft.) long?
If all the strings were connected together, how long do
you think they would be?
➪
Find some objects 6m (20
ft.) long that students are
familiar with in your local
area.
5. Find the sum.
a. Return to the Home screen.
- l
b. Access the - v
MATH
menu and select
sum
.
- v " " J
c. Calculate the sum.
- v Y E b