• The example calculations are all performed using the Decimal mode (see page 44).

Using the eKey

Use the ekey to input exponential values. You can also input exponential values using the E key on the soft keyboard [Number] key set.

0202 Calculation examplesOmitting the Multiplication SignYou can omit the multiplication sign in any of the following cases.•In front of a function… 2sin (30), 10log (1.2), etc.•In front of a constant or variable… aπ, 2ab, 3ans, etc.•In front of an open parenthesis… 3(5 + 6), (a + 1)(b – 1), etc.

Note that you must use a multiplication sign when the expression directly in front of the open parenthesis is a literal variable. Example: ab (3 + b) must be written ab × (3 + b). Otherwise, your input is considered to be in function notation ( f(x)).

•In front of the ekey or E key (See “Using the eKey” above.)•In front of a matrix or list… a {1, 2, 3}, 3 [[1, 2] [3, 4]], etc.Using the Answer Variable (ans)

Any time you execute a calculation in the Main application work area, the last result is assigned automatically to a variable named “ans” (answer). You can even recall current “ans” variable contents and input them into another calculation by tapping the D key on the soft keyboard.

0203 Calculation examples

Tip: Starting a calculation expression with +, −, ×, ÷, or ^ operator will cause the “ans” variable to be inserted automatically to the left of the operator, even if you do not tap the D key.

Assigning a Value to a Variable

Besides using the variable assignment key (W, page 31), you can also use the syntax shown below in the Main application and eActivity application to assign a value to a variable.

Syntax: Variable: = value0204 Assign 123 to variable x

Important!

“:=” can be used only in Main and eActivity. It can NOT be used in a program. In the Program application, you must use W to store a value to a variable.

Chapter 2: Main Application

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