At 36 years old, its been probably 20 years or longer since I dabbled in anything beyond basic math.
Khan’s site though is hugely fun for me now, for whatever reason (I don’t even really remember what the impulse was to start this now anyway) — it’s like being back in school but without any stress or pressure.
IMPORTANT: Numeric entry fields must not contain dollar signs, percent signs, commas, spaces, etc. Click the Terms tab above for a more detailed description of each entry.
Select the type of math you will be performing (Basic Math, Pre-Algebra, Algebra, Trigonometry, Pre-calculus, Calculus, Statistics, Finite Math, Linear Algebra, or Chemistry) from the drop-down menu (stacked bar icon).
Back away from the calculator; use your brain first.
Your mind analyzes, plans, and guides in the labyrinthine quest for the solution.
Note that if you are unsure how to enter a problem, tap the stacked dots icon in the upper right-hand corner to see a list of example entries.
If you would like to view the step-by-step solution, tap the "Tap to view steps ..." link.
But even more amazing than the calculator itself, was when the creators offered to provide a miniature version of their calculator for free to my site's visitors.
Well, since I couldn't create a calculator anywhere close to the one I discovered, I decided to accept their offer instead of trying to build one myself.