Texas Instruments TI-15 Teachers Manual page 114

Place Value
How to Use the Place Value Function
When you use the place value function, you can determine the place value of a
specific digit OR the number of ones, tens, hundreds, etc. in a given number.
The ‹ mode setting must be Manual and the display option 11-.
To determine:
Place Value
How Many?
When determining How Many?, be sure to explain to students that
12_ _ . _ _ _ (after you press ' on page 110) represents 12 hundreds in
the number 1234.567, or that 123456 . _ (after you press ™)
represents 123,456 hundredths in the number 1234.567.
When a number includes a repeated digit, the calculator first analyzes
its occurrence in the right-most position. To find the place value of other
instances, press the digit again. (See page 109 for an example.)
Once Πis active, it is not necessary to press this key before each digit.
To enter a new number, however, you must press ", enter the number,
and then press Πagain.
To exit Place Value, press " and the TI-15 returns to Problem Solving,
Manual mode.
How to Use What's the Digit Function
Another way to display place value is to show the digit that is in the ones
place, the tens place, etc.
The ‹ mode setting must be Manual and the display option -1-.
To determine:
What's the Digit?
To exit Place Value, press " and the TI-15 returns to Problem Solving,
Manual mode.
© 2000 T I
EXAS NSTRUMENTS
Follow these steps:
Enter the number, press Œ, and press
the digit.
Enter the number, press Œ, and press
", ', ', , ˜, ™, or š.
Follow these steps:
Enter the number, press Œ, and press
", ', ', , ˜, ™, or š.
I
NCORPORATED
TI-15: A Guide for Teachers
14
Example:
Page 108
Page 110
Example:
Page 111
107