All Calculator Keys And Functions

Common Calculator Functions:

This reference guide explains all standard calculator keys and their functions.

Calculator Keys Reference

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1. Basic Operation Keys

These are the fundamental keys found on all calculators:

0-9 — Number keys for inputting values
+ — Addition
- — Subtraction
× — Multiplication
÷ — Division
= — Executes calculation
. — Decimal point
± — Toggle positive/negative
C or AC — Clear/All Clear

2. Memory Function Keys

Keys for storing and recalling values:

MC — Memory Clear (erases stored value)
MR — Memory Recall (recalls stored value)
M+ — Memory Add (adds to stored value)
M- — Memory Subtract (subtracts from stored value)
MS — Memory Store (stores current value)

3. Advanced Function Keys

Scientific calculator functions:

√ — Square root
x² — Square
x^y — Power function
sin/cos/tan — Trigonometric functions
log/ln — Logarithm functions
π — Inserts pi constant
e — Inserts Euler's number
! — Factorial

4. Special Purpose Keys

Additional useful keys:

% — Percentage calculations
CE — Clear Entry (clears current input)
DEL — Delete last digit
ANS — Recall last answer
EXP — Scientific notation input
DRG — Degree/Radian/Grad mode toggle
2nd — Access secondary functions

5. Frequently Asked Questions (FAQ)

Q1: What's the difference between C and CE?
A: C (Clear) typically clears the entire calculation, while CE (Clear Entry) only clears the current number being entered.

Q2: How do memory functions work?
A: Memory functions let you store a value (MS), add to it (M+), subtract from it (M-), recall it (MR), or clear it (MC).

Q3: What does the 2nd key do?
A: The 2nd key activates secondary functions printed above the main keys on scientific calculators.

Q4: Why doesn't my basic calculator have memory functions?
A: Memory functions are typically only included on scientific and financial calculators, not basic four-function models.

Q5: How do I use percentage calculations?
A: To calculate 15% of 200, enter: 200 × 15 % = (result: 30). To add 15% to 200, enter: 200 + 15 % = (result: 230).