# Chapter 17 - Numbers In Different Bases; The Base Menu; Writing Non-decimal Numbers - HP 48gII User Manual

Graphing calculator.

Chapter 17
Numbers in Different Bases
Besides our decimal (base 10, digits = 0-9) number system, you can work
with a binary system (base 2, digits = 0,1), an octal system (base 8, digits =
0-7), or a hexadecimal system (base 16, digits=0-9,A-F), among others. The
2
1
0
same way that the decimal integer 321 means 3x10
+2x10
+1x10
, the
number 100110, in binary notation, means
5
4
3
2
1
0
1x2
+ 0x2
+ 0x2
+ 1x2
+ 1x2
+ 0x2
= 32+0+0+4+2+0 = 38.

The BASE menu is accessible through ‚ã(the 3 key).
With system
flag 117 set to CHOOSE boxes (see Chapter 1 in this guide), the following
entries are available:
With system flag 117 set to SOFT menus, the BASE menu shows the following:
This figure shows that the LOGIC, BIT, and BYTE entries within the BASE menu
are themselves sub-menus. These menus are discussed in detail in Chapter 19
of the calculator's user's guide.

### Writing non-decimal numbers

Numbers in non-decimal systems, referred to as binary integers, are written
preceded by the # symbol („â) in the calculator. To select the current
base to be used for binary integers, choose either HEX(adecimal), DEC(imal),
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