Problem Solving In Manual Mode - Texas Instruments TI-15 Explorer Owner's Manual

9. Problem solving in Manual mode

Manual problem solving

a. If you are not already in Problem Solving, press the  key to enter Problem Solving.
The  and indicators are displayed, along with a randomly generated problem.
Auto

b. Press to enter the Problem Solving menu. First your score is displayed, and then
the first selection, AUTO MAN. Press  to underline MAN. Press  to confirm your

selection. Press
The  indicator is displayed, but not the
you are in Manual rather than Auto mode. No problem is automatically generated. You can
now enter your own problems.
Entering your own problems

a. Enter a problem such as        .
There are 25 solutions to the problem.
Note that the calculator will only use positive integers and will
count 1 + 23 as different from 23 + 1.
The process is not algebraic either as the ? can represent different whole numbers.
b. Press  .
Press  .
c.
d. The original question appears again. Press  .
e. Press .
2 plus 22 will equal 24.
f. Continue exploring all 25 combinations of integers that, when added together, equal 24.
Exploring inequalities while in MAN problem solving mode

Press once for LESS THAN, and  for GREATER THAN.
The calculator will indicate whether a statement is correct (YES) or incorrect (NO).
a. Key in 8 + 5 = 10 + 3  (YES is displayed)
b. Key in 16 – 3 < 16 + 3  (YES is displayed)
c. Key in 25 = 12 + 13  (YES is displayed)
d. Key in 6 - 2 > 8  (NO is displayed, then the correct inequality 6 - 2 < 8 YES
to exit the menu and return to Problem Solving.
Auto
2 + ? = 24 is displayed. 2 is one of the numbers that will fit..
2 + 12 < 24 is displayed along with NO.
2 + 22 = 24 is displayed along with YES.
indicator. You are still in Problem Solving, but
2 plus 12 is LESS than 24.
2 + ? = 24 is displayed again.
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