Multiple question formats on one slide

Numeric values will probably need an input field that uses built-in system variables (or those of your own creation). You would then likely need to have a Submit button that checks the variables for accuracy. (That's been my - very limited - experience with numeric quiz inputs.)

You could try a slightly different technique to measure your learner's comprehension here: provide a "number bank" similar to what you already have with the signs/symbols; learners would have to select and drag the number to the correct distance boxes. Perhaps you have considered this, and if so, no worries.

Good luck!