16
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
Auto
indicators are displayed, along with a randomly generated problem.
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
to exit the menu and return to Problem Solving
.
The
indicator is displayed, but not the
Auto
indicator. You are still in Problem Solving, but
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
.
2 + ? = 24
is displayed.
2
is one of the numbers that will fit..
c. Press
.
2 + 12 < 24
is displayed along with
NO
. 2 plus 12 is LESS than 24.
d. The original question appears again. Press
.
2 + ? = 24
is displayed again.
e. Press
.
2 + 22 = 24
is displayed along with
YES
.
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
