Typeset direct code children (for multiple, etc)

Test Plan:
scientific_notation.html?debug&problem=0&seed=56 shows the "x 10".

Auditors: emily
fix rounding in hint, fix #53771

no rounding to the ten thousandth before rounding to the thousandth.
example: *1/22 = .04545* should be rounded from *.0454* not from *.0455*
Merge pull request #53842 from mauk81/patch-4

fix rounding in hint, fix #53771
Change selector for new location of style el

Goes with rWE3304e88aaf5df4ddbedeb9214d781cc3381aa964.

Auditors: benkomalo