math-calculator

name	math-calculator
description	Calculate simple mathematical expressions using shell commands. Use when the user asks to perform arithmetic calculations like addition, subtraction, multiplication, division, or more complex math expressions.
license	Apache-2.0
compatibility	Requires bash with bc (basic calculator)

Math Calculator Skill

This skill provides the ability to calculate mathematical expressions using shell commands.

When to Use

Use this skill when:

• Performing arithmetic calculations (add, subtract, multiply, divide)
• Evaluating mathematical expressions with parentheses
• Computing percentages or powers
• Any numeric computation requested by the user

Methods

Using bc (Basic Calculator)

The bc command is a powerful calculator that supports:

• Basic arithmetic: +, -, *, /
• Power: ^
• Parentheses for grouping
• Scale for decimal precision

Example:

echo "2 + 3 * 4" | bc
# Output: 14

echo "scale=2; 10 / 3" | bc
# Output: 3.33

echo "(2 + 3) * 4" | bc
# Output: 20

Supported Operations

Operation	Symbol	Example
Addition	+	5 + 3 = 8
Subtraction	-	10 - 4 = 6
Multiplication	*	6 * 7 = 42
Division	/	15 / 3 = 5
Power	^ (bc) or ** (Python)	2 ^ 3 = 8
Modulo	%	17 % 5 = 2
Square Root	sqrt() (bc)	sqrt(16) = 4

Notes

• Use scale=N in bc to set decimal precision (default is 0, integer only)
• For floating-point division, always set scale in bc