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ClassPad 101 Lesson 2 CASIO COPYRIGHT
©
2007 Author: Diane Whitfield
CASIO MRD Center, Portland, Oregon, USA
10
2. Status Bar and One Line at a Time
3. Changing Base
What does “base” mean? It has to do with place value. Well, as you know,
234=2*100+3*10+4. This can also be written as 234=2*10
2
+3*10
1
+4*10
0
(note that any # raised to the 0 power equals 1 except 0
0
).
We work in base 10, but computers often work in base 2 or base 16. Base 2
is called binary and base 16 is called hexadecimal. For example, 5 in base
2 is 101=1*2
2
+0*2
1
+2
0
. There are also many other bases that are common.
You could really write a number in any base you want to!
For now, we will experiment with base 2 (binary) only. You may someday
find this useful! It is definitely fun to think in a different base.
a. Notice your status bar
b. Click Decimal to toggle
it back to Standard
c. Click on your first math
line and then the
button
d. Notice only the 1
st
output changed
*One line at a time please!
**Or, press EXE to re-
execute everything.
a. Open Main and clear the
window
b. Click the 1
st
n on the
toolbar and select
c. Input 101+11 and
press EXE
d. Input 2 and press EXE
e. Bin mode (base 2) only
knows 0 and 1!
f. Change 2 to 2d to let
the software know you
mean base 10
g. Press EXE
h. Note 10b=1*2
1
+0*2
0
=2 (base 10)
Just ta
p
it!
Notice the status bar
shows Bin (short for
Binar
y)
.