Arranging gap boxes within latex

[David Wishart]

I'd like to use gap boxes within a formatted equation for a student answer, something like the image below with the black boxes being replaced by gap entries.

The overall purpose is to ease the awarding of partial marks for a question with quite of working out before the final answer. Is this possible? 

[Christian Lawson-Perfect]

This isn't possible in MathJax 2, which Numbas currently uses.

MathJax 4, which has been in the works for quite a while, will allow embedding arbitrary HTML inside equations (see https://github.com/mathjax/MathJax-src/releases/tag/4.0.0-alpha.1#embedded-html). I don't know when that will be available, but I'll try to upgrade to it as soon as possible.

Until then, the compromise we've historically gone with is to put placeholder letters in the expression, then have a list of gaps asking the student to give values for each of them.

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[David Wishart]

Thanks for the clarification Christian. I was thinking about placeholders as a back up plan. I'll have a chat with the lecturer whose question this is and see what they prefer.