Changing how EngineeringForm output is being displayed

Questions
1
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2

By default, EngineeringForm uses exponents that are multiples of 3. If what you want is a single digit left of the point, then use ScientificForm instead.

3

thank you!

4

You can do it in both forms by specifying the Precision, i.e. the total number of digits in the mantissa:

EngineeringForm[66666.66`7]

or

ScientificForm[66666.66`7]

If you want to present the mantissa with only one digit before the dot in EngineeringForm you must set the option ExponentStep equal to 1:

EngineeringForm[66666.66`7, ExponentStep -> 1]