Appendix
A-2: Arithmetic Calculations
Example A-2.1
Evaluate 23+57 both exactly and as a floating-point (decimal) number.
Solution
Interactive Solution
In math mode, type in the sum. (Fractions are set with the slash (/). Use the right-arrow key to move from the denominator.)
Context Panel: Evaluate and Display Inline (Context Panel: See Table A-1.2.)
Context Panel: Approximate≻10
23+57 = 2921→at 10 digits1.380952381
Alternatively, include at least one floating-point number in the sum
Context Panel: Evaluate and Display Inline
2.03+57 = 1.380952381
Coded Solution
Assign the sum to a name such as S. (Assignment: use Colon + Equal (:=))
Press the Enter key to evaluate.
S≔23+57
S:=2921
Apply the evalf command to S.
evalfS
1.380952381
By assigning a value to a name such as S, the name can later be used in place of the value. The evalf command changes an exact number into a floating-point (decimal) value.
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