Add, subtract, multiply matrices, and find determinants (2×2 or 3×3).
Calculate the probability of combined independent events.
Find the best time to sleep or wake up based on 90-minute cycles.
Generate the Fibonacci sequence up to N terms.
Check if a number is a perfect number.
Check if a number is an Armstrong (narcissistic) number.
Calculate total hours worked across multiple shifts.
Donaldson R F