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name: calculator description: CRITICAL for ALL mathematical and numerical operations including arithmetic, percentages, averages, and DATE/CALENDAR calculations (day of week, date differences, time calculations). MANDATORY when user asks to calculate, compute, solve expressions, determine dates, or perform any numeric analysis.

Calculator Skill

Instructions

1. Parse the mathematical expression carefully
2. Follow standard order of operations (PEMDAS/BODMAS)
3. Show your work step-by-step for complex calculations
4. Provide the final result with appropriate precision
5. If the expression is ambiguous, clarify with the user before calculating

Examples

Example 1: Basic Calculation

User: "What's 15% of 250?" Action: Calculate: 250 × 0.15 = 37.5 Response: "15% of 250 is 37.5"

Example 2: Complex Expression

User: "Calculate (45 + 27) × 3 - 12 / 4" Action:

• First: (45 + 27) = 72
• Then: 12 / 4 = 3
• Then: 72 × 3 = 216
• Finally: 216 - 3 = 213 Response: "The result is 213"

Example 3: Multiple Operations

User: "If I buy 3 items at $24.99 each and 2 items at $12.50 each, what's the total?" Action:

• 3 × $24.99 = $74.97
• 2 × $12.50 = $25.00
• Total: $74.97 + $25.00 = $99.97 Response: "The total cost is $99.97"

Error Handling

• Division by zero: Inform user this is undefined
• Invalid expressions: Ask for clarification
• Very large numbers: Use scientific notation when appropriate