HP·38E/38C - Slide Rule Museum

Arithmetic Operators [±J El 0 G
To perfonn an arithmetic operation:
1. Key in the first number.
Using Your Calculator 19
2. Press IENTER_I to separate the first number from the second.
3. Key in the second number.
4. Press the proper key 0, G , 0, or G to perform the desired
arithmetic operation .
Solve Keystrokes Display
10 -7- 5 10 IENTER_I 5 G 2.00
10 + 1+2+3 10 lENTER_ 1 1 0
2030
16.00
Refer to Your HP Financial Calculator for further information concerning
simple arithmetic, chain arithmetic, and the order of execution.
Percentage 00
To find the percentage of a number, key in that base number and press
lENTER_I. Then key in the numerical value of the percent and press [ill.
Calculate
13% of 2,500
Keystrokes
2500 lENTER-1
13 [ill
Display
2,500.00
325.00
Notice that the keystroke sequence is similar to the keystrokes you
learned for arithmetic operations. The function happens immediately
when you press the [ill key.
Net Amount [ill0 or [illG
It is easy to calculate the net amount because the calculator automatically
holds the base number while you calculate percentages. To find the net
amount, calculate the percentage amount and then press 0 or G depending
on whether you wish to add or subtract that amount from the
base number.