Lecture Notes: Calculator Hacks for Math Exams

Introduction to Calculator Hacks

• Discussion on using calculators efficiently in exams
• Emphasis on practical hacks to save time and ensure accuracy in mathematical calculations

Hack 1: Table Mode

• Purpose: Used for plotting graphs from equations.
• Steps:
  • Access table mode via menu option (click 3).
  • Input the equation using the x button (alpha and right bracket).
  • Specify start and end numbers (e.g., from -2 to 4 with steps of 1).
  • Use results as x and y coordinates for graph plotting.
• Applications: Useful for quadratic, linear, cubic, and reciprocal graphs.

Hack 2: Prime Factors

• Purpose: To find the product of prime factors.
• Steps:
  • Exit table mode and enter a number (e.g., 84).
  • Use the fact button (shift and fact) to get the prime factors.
  • Example: 84 = 2^2 × 3 × 7.
• Applications: Calculating highest common factor (HCF) and lowest common multiple (LCM).
  • Example: HCF of 60 and 84 is 12.
  • LCM of 60 and 84 is 420.

Hack 3: Time Button

• Purpose: To handle questions involving speed, distance, and time.
• Formula: Speed = Distance / Time.
• Steps:
  • Convert decimal time (e.g., 0.8) into hours and minutes using the time button.
  • Example: 0.8 hours converts to 48 minutes.
• Applications: Useful for calculating travel times.

Hack 4: Percentage Button

• Purpose: Simplify compound interest and percentage increase calculations.
• Steps:
  • Use the percentage button to find multipliers (e.g., 103.5% becomes 1.035).
  • Calculate compound interest using the multiplier.
  • Example: Increasing £2000 by 3.5% over two years followed by 2.5% over three years.
• Result: Final amount is £2307.18 rounded to the nearest penny.

Hack 5: Storage Button

• Purpose: Efficiently handle iterations and store/reuse values.
• Steps:
  • Use the answer button for iterative calculations.
  • Store numbers using the storage function (store as A, B, C, etc.).
  • Recall stored values when needed.
• Applications: Useful for scenarios involving multiple steps and precise calculations.

Conclusion and Tips

• Always reset the calculator before exams to ensure default settings (degrees mode).
• Consider using these hacks to optimize calculator usage and increase efficiency during exams.
• Reminder of additional resources and programs available for further math revision and preparation.
• Option to sign up for a rapid revision program or live interactive lessons for further support.