HP 33s Scientific ‘3 z, 2–12, ‘10 ›, 14 ›2, 3 ‘4 ›, 5 ‘6 ›, sequentially–entered, Calculate 2 ⎟ (3 + 10):, Calculates (3 + 10) first, Calculates 4 ⎟ 33, the answer

Now study the following examples. Remember that you need to press ‘ only to separate sequentially–enterednumbers, such as at the beginning of a problem The operations themselves (›, …, etc.) separate subsequent numbers and save intermediate results. The last result saved is the first one retrieved as needed to carry out the calculation.

Calculate 2 ⎟ (3 + 10):

Keys:Display:Description:

3	‘10 ›	)
2	[q	)

Calculate 4 ⎟ [14 + (7 ⋅ 3) – 2] :

Calculates (3 + 10) first.Puts 2 before 13 so the division is correct: 2 ⎟ 13.

Keys:Display:Description:

7	‘3 z	)
14 ›2		)
4	[	)
q		)

Calculates (7 ⋅ 3). Calculates denominator.

Puts 4 before 33 in preparation for division.Calculates 4 ⎟ 33, the answer.

Problems that have multiple parentheses can be solved in the same manner using the automatic storage of intermediate results. For example, to solve (3 + 4) ⋅ (5 +

6)on paper, you would first calculate the quantity (3 + 4). Then you would calculate (5 + 6). Finally, you would multiply the two intermediate results to get the answer.

Work through the problem the same way with the HP 33s, except that you don't have to write down intermediate answers—the calculator remembers them for you.

Keys:Display:Description:

3 ‘4 ›	)
5 ‘6 ›	)
z	)

First adds (3+4) Then adds (5+6)Then multiplies the intermediate answers together for the final answer.

2–12RPN: The Automatic Memory Stack