There's a routine I've fallen into during evening study sessions: five browser tabs open, each with a different calculator, and a notebook in front of me. The calculators aren't there to do my homework — they're there to keep me honest about it.
Here are the five I rely on most.
1. Step-by-step equation solver
For linear, quadratic and rational equations, I use the main solver and read its full set of step explanations: https://equation-solver.org/en/blog/
The blog at that address also has short tutorials and worked examples that complement the calculator. When I get stuck, I read one of those explainers, redo my own work on paper, then plug the equation into the solver only as a final check.
2. Derivative calculator
For Calculus I, the derivative tool plus the "Basic Derivative Rules" reference page on the same site has been a lifesaver. The rules page lays out power, product, quotient and chain rules with small worked examples — exactly what I need before starting a problem set.
3. GCD / LCM helper
Whenever I'm adding fractions with awkward denominators, I run the numbers through a GCD/LCM helper first. It saves the embarrassment of getting an answer right but in a non-reduced form.
4. Percentage calculator
I use a percentage tool for problems involving discounts, mixtures and growth rates. The "Percentage Calculations" article on the same blog explains how to translate word problems into the right percentage formulas, which has helped me on word-problem-heavy quizzes.
5. Linear systems solver
For 2×2 and 3×3 systems, the linear systems solver shows substitution and elimination side by side. Comparing methods is how I figured out which one I prefer for which kind of system.
How I actually use them
The trick is order of operations — for me, not the math. Always set up the problem on paper first, write out what method you intend to use, and only then open the calculator to verify the result. When the calculator disagrees with my work, I retrace my steps before trusting either answer.
If you want a single starting point for the calculators and the short articles, the blog index lives at https://equation-solver.org/en/blog/ — bookmark it and treat it like a study companion, not a shortcut.
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