A more customizable zetamac-type drill.
Fraction answers can be input as fractions in the form "a/b" or as mixed numbers with a single space in the form "a b/c".

Known bugs that I can't be bothered to fix yet: If the upper and lower bounds are too close in fraction mode in gets weird.
Math rendering may not work on all browsers.
There's probably something wrong with parsing fraction input if you try hard to break it.
If you finish a run and refresh the page, the checkboxes (probably) won't be correct. You have to hard refresh.


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