<s>
The	O
TI-108	B-Device
is	O
a	O
basic	O
handheld	O
calculator	B-Application
manufactured	O
by	O
Texas	O
Instruments	O
aimed	O
at	O
introducing	O
younger	O
students	O
to	O
basic	O
arithmetic	O
and	O
calculator	B-Application
functionality	O
.	O
</s>
<s>
The	O
TI-108	B-Device
is	O
widely	O
used	O
among	O
younger	O
students	O
due	O
to	O
its	O
low	O
cost	O
,	O
durability	O
,	O
and	O
simplicity	O
.	O
</s>
<s>
Along	O
with	O
the	O
more	O
expensive	O
and	O
newer	O
TI-10	O
,	O
this	O
calculator	B-Application
targets	O
the	O
K-3	O
student	O
group	O
for	O
whom	O
it	O
will	O
likely	O
be	O
a	O
first	O
calculator	B-Application
.	O
</s>
<s>
The	O
TI-15	B-Device
is	O
targeted	O
to	O
older	O
students	O
.	O
</s>
<s>
The	O
TI-108	B-Device
is	O
the	O
last	O
member	O
of	O
the	O
TI	O
calculator	B-Application
family	O
to	O
continue	O
a	O
design	O
language	O
first	O
introduced	O
in	O
the	O
mid-1980s	O
,	O
with	O
textured	O
keys	O
and	O
straight	O
edges	O
with	O
curved	O
bottom	O
corners	O
,	O
as	O
well	O
as	O
a	O
recessed	O
frame	O
around	O
the	O
display	O
.	O
</s>
<s>
This	O
design	O
was	O
also	O
shared	O
with	O
the	O
landscape-aspect	O
Galaxy	O
line	O
of	O
scientific	O
calculators	B-Application
,	O
though	O
the	O
textured	O
keys	O
were	O
not	O
used	O
on	O
contemporary	O
portrait-aspect	O
designs	O
due	O
to	O
a	O
lack	O
of	O
space	O
.	O
</s>
<s>
The	O
current	O
model	O
108	O
is	O
,	O
at	O
least	O
externally	O
,	O
virtually	O
identical	O
to	O
the	O
original	O
TI-108	B-Device
introduced	O
in	O
1990	O
,	O
and	O
is	O
the	O
cheapest	O
design	O
in	O
the	O
TI	O
calculator	B-Application
line	O
.	O
</s>
<s>
Though	O
the	O
internal	O
electronics	O
are	O
different	O
,	O
the	O
TI-108	B-Device
is	O
fundamentally	O
the	O
same	O
as	O
the	O
TI-1100II	O
introduced	O
in	O
1985	O
,	O
a	O
four-function	O
calculator	B-Application
with	O
additional	O
square	O
root	O
and	O
percentage	O
keys	O
.	O
</s>
<s>
TI-108s	B-Device
are	O
mostly	O
found	O
and	O
used	O
in	O
school	O
classrooms	O
.	O
</s>
<s>
Basic	O
calculators	B-Application
do	O
not	O
follow	O
the	O
order	O
of	O
operations	O
and	O
most	O
of	O
them	O
do	O
not	O
have	O
a	O
command	O
line	O
in	O
which	O
parentheses	O
can	O
be	O
entered	O
;	O
they	O
merely	O
evaluate	O
each	O
expression	O
in	O
the	O
order	O
in	O
which	O
they	O
are	O
given	O
.	O
</s>
<s>
The	O
TI-108	B-Device
has	O
a	O
very	O
simple	O
feature	O
that	O
stores	O
one	O
number	O
in	O
memory	B-General_Concept
;	O
it	O
is	O
by	O
default	O
zero	O
.	O
</s>
<s>
The	O
M	O
-	O
and	O
M+	O
keys	O
will	O
respectively	O
subtract	O
or	O
add	O
the	O
number	O
on	O
the	O
screen	O
to	O
the	O
number	O
in	O
memory	B-General_Concept
,	O
and	O
the	O
MRC	O
key	O
recalls	O
this	O
memory	B-General_Concept
number	O
.	O
</s>
<s>
By	O
keeping	O
the	O
current	O
number	O
in	O
memory	B-General_Concept
,	O
subtracting	O
and	O
adding	O
to	O
it	O
with	O
the	O
memory	B-General_Concept
keys	O
,	O
and	O
then	O
multiplying	O
and	O
dividing	O
it	O
in	O
the	O
normal	O
fashion	O
,	O
a	O
problem	O
of	O
arithmetic	O
can	O
be	O
done	O
in	O
the	O
proper	O
order	O
with	O
the	O
TI-108	B-Device
without	O
physically	O
writing	O
down	O
results	O
intermittently	O
.	O
</s>
