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2
Basic Keyboard/GENERAL MATHEMATICS USING THE SHARP EL-9900
Copyright © 2002, Sharp Electronics Corporation. Permission is granted to photocopy for educational use only.
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
1
+ b
2
) where h
is the height or distance between the parallel sides b
1
and b
2
.
1. Calculate ( ) × (3 + 4).
STEP 1: Enter ( ) by pressing
(
5
a
/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
×
+
–
÷
h
2
5
2
5
2
5
2
▼
▼
▼
▼
h
b
1
b
2
▼
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