A plain calculator for everyday sums: add, subtract, multiply and divide, with percent and backspace keys.
Open in the full calculator → — with every other tool, the AI tutor and PNG export.
From the article How to Use an Online Calculator to CHECK Homework, Not Do It.
1. Solve the whole set first. Do all ten numericals on paper before you
open anything. Yes, even the ones you are unsure about — especially those.
2. Mark each answer with your own confidence before checking: a tick if you
are sure, a question mark if you guessed. This single habit is what turns checking into
diagnosis.
3. Now open the tool and check the final answers, one by one.
4. For every wrong answer, do not look at the correct value and move on.
Go back to your own working and find the exact line where it went wrong. Circle that line.
5. Re-solve that problem from a blank line the next day, without the tool
open. Only then is it fixed.
Worked in full in How to Use an Online Calculator to CHECK Homework, Not Do It.
This is one of the tools in the Chemistry Calculator Suite, a free calculator built for IIT-JAM, CSIR-NET, GATE and CUET (Chemical Science) preparation. Nothing is behind a login and no result is stored on a server — the arithmetic runs in your own browser.
The Basic Calculator calculator above is the live tool — type your values and press its button; the answer appears in the same box. The link under it opens the full suite with this tool already selected, next to the others.