HP 20b Consultant Financial manual 3I4+, 5I6+

Mathematical Calculations

You do not need to enter parentheses to set the priority of your operations in RPN. Key in numbers and operations inside the parentheses first, followed by those outside of the parentheses. If a problem has more than one set of parentheses, start by working with the operations and numbers in the innermost parentheses and work out. For example, calculate: (3 + 4) x (5 + 6).

One way to calculate this problem is to key in the numbers and operations within the parentheses first, followed by the operations outside of the parentheses. See Table 2-2 below.

Table 2-2Simple Arithmetic Calculations in RPN Mode

Keys	Display	Description
3I4+		Inputs the numbers and the
		operation in the first set of
		parentheses. Intermediate results
		are displayed. Note the (+) and
		(RPN) annunciators.
5I6+		Inputs the numbers and the
		operation in the second set of
		parentheses. Intermediate results
		are displayed. Note the (+)
		annunciator.

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