Basic Pocket Calculator
Perform standard mathematical operations with a beautiful interactive pocket interface. Save calculations, view history, and trace formulas step-by-step.
Memory status
Understanding Everyday Pocket Arithmetic
In standard pocket calculators, execution is **sequential** (also known as immediate execution mode). This means that operations are performed in the order they are typed.
Sequential Execution vs Order of Precedence
Most scientific calculators and computer programming languages evaluate equations using the strict mathematical order of precedence (PEMDAS/BODMAS): Parentheses/Brackets, Exponents, Multiplication & Division (from left to right), and Addition & Subtraction (from left to right).
Under PEMDAS, an equation like $5 + 2 \times 10$ evaluates to $25$ because the multiplication ($2 \times 10 = 20$) is done first, followed by addition ($5 + 20 = 25$).
On a standard pocket calculator, the same inputs result in $70$. As you type $5 + 2$, the calculator holds $7$. When you press $\times$, it establishes the intermediate state. When you enter $10$ and press $=$, it multiplies the cumulative total ($7$) by $10$, producing $70$.
Memory Operations Simplified
The memory keys serve as a temporary storage scratchpad:
- M+ (Memory Plus): Takes whatever is on the screen and adds it to the value in the memory bank.
- M- (Memory Minus): Subtracts the current screen value from the value in the memory bank.
- MR (Memory Recall): Retrieves the current value in the memory bank and places it on the screen.
- MC (Memory Clear): Resets the memory bank to $0$.