Sharp EL-120 User Manual download pdf (Page 4)

Basic Keyboard/GENERAL MATHEMATICS USING THE SHARP EL-9900

Press to access the calculation screen.

A trapezoid is a four-sided figure where two of the sides are parallel

and the other two sides are not parallel.

The area of a trapezoid is defined to be Area = ( )•(b

+ b

) where h

is the height or distance between the parallel sides b

and b

1. Calculate ( ) × (3 + 4).

STEP 1: Enter ( ) by pressing

(

/b 2

)

STEP 2: Multiply by pressing the × key.

STEP 3: Enter (3 + 4) by pressing

(

3 + 4

)

STEP 4: Calculate by pressing the ENTER key.

The answer is 17.5

2. Edit the previous calculation to find ( )•(7 + 4).

STEP 1: Edit the previous calculation by pressing 2ndF ENTRY

to move the blinking cursor to highlight the 3.

STEP 2: Delete the 3 by pressing DEL to backspace delete.

STEP 3: Insert the 7 by pressing 7 .

STEP 4: Calculate by pressing the ENTER key.

The answer is 27.5.

PARENTHESES AND EDITING

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Sharp EL-120 User Manual Page 4