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Lecture notes Business mathematics (BMD115D)
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Notes and in depth explanation of how to use a calculator.
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7CHAPTER 2
USING THE CALCULATOR
AIM: To understand the outlay of the SHARP EL-531LH Scientific calculator.
To understand the key sequences for the pocket calculator.
To estimate the answer by rounding off numbers.
To know the order of operations.
To realize how clever your pocket calculator is.
To use the memory function on the pocket calculator.
2.1 THE OUTLAY OF THE SHARP EL-531LH SCIENTIFIC CALCULATOR
DEG M
MODE < 0:NORMAL 1: STAT x
MDF CA OFF
de ?
2 nd F MODE DEL ON / C
= <
arc hyp sin -1 cos -1 tan -1 DRG< n!
hyp sin cos tan DRG %
x -1
10 x ex n Pr
yx x2 log ln n Cr
x y
B d/c : DEG ALPHA M-
,
Exp a b/c D°M’S RCL STO M+ M
DATA CD
6 r2 : xy 0 n
7 8 9 ( )
SX FX
4 5 6 x ÷
3x 3x2
1 2 3 + -
RANDOM FSE TAB ANS
, 8
The DEG and M should always be showing on the screen if you put the calculator on.
2.2 KEY SEQUENCE
S A key sequence is the order in which we press the calculator keys to solve a sum.
S Work from left to right to get the final answer.
S Once you have pressed = the operation is complete and the calculator is ready for the
next operation.
S If you see an Error (or E) on your calculator screen, you have to clear the display before
you can go on.
S To correct an operation ( + ; - ; x ; ÷ ) sign the following steps are necessary to correct
it: * press the back arrow key = ;
* then the DEL key ;
* now you are able to press the correct operation key.
S To correct an incorrect number, press the DEL key to erase each incorrect number,
then go on.
_ CA clears everything and DEL clears the last entry.
EXAMPLE 2.1
To solve : 35 + 32
The following key stokes are necessary : 35 + 32 =
The answer is now on the display : 67
EXERCISE 2.1
Try the following EXERCISES yourself : Answer
2.1.1 58 + 42 º 58 + 42 = (100)
2.1.2 132 - 45 º 132 - 45 = (87)
2.1.3 208 + 115 (323)
2.1.4 1455 - 455 (1000)
2.1.5 419 + 345 - 65 (699)
2.1.6 499 - 361 + 1423 (1561)
2.3 ESTIMATING THE ANSWER
2.3.1 What is estimating
Estimating is when you think about a calculation and you make an intelligent guess at the
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