Mental maths
Quick sums against the clock · Learn ●○○
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Prompt
Make a mental maths drill with adding and subtracting, up to two digits. Make it a single HTML file that opens in a browser with nothing to install and no other files. Put the CSS and JavaScript inside it. Do not use image files or any external address; use emoji or letters if you need a symbol. Two minutes on the clock. Show one sum at a time and count how many I get right. Keep division and subtraction tidy: no negative answers and no remainders, unless I asked for something that needs them. A sum I cannot do in my head is not practice, it is arithmetic homework. Show the running score and the time left. At the end, show how many I got, how many I missed, and my average time per sum. When you are done, generate fifty sums and confirm none of them have a negative or fractional answer.
What it uses: One file only · Say what it is first · Decide what shows · Have it check itself
If awkward sums appear, ask it to "generate the answer first and work backwards to the question".
Paste what came back
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