Fix units for values div mul

[t-young31]

Resolves #241

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Checklist

• [x] The changes include an associated explanation of how/why
• [x] Test pass
• [x] Documentation has been updated

[codecov[bot]]

Codecov Report

:exclamation: No coverage uploaded for pull request base (v1.3.5@c37322c). Click here to learn what that means. The diff coverage is n/a.

@@            Coverage Diff            @@
##             v1.3.5     #242   +/-   ##
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  Coverage          ?   97.14%           
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  Files             ?      196           
  Lines             ?    20172           
  Branches          ?        0           
=========================================
  Hits              ?    19597           
  Misses            ?      575           
  Partials          ?        0           

Flag	Coverage Δ
unittests	97.14% <0.00%> (?)

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