The rules of standard form are easy- the number must be between 1 and 10. Therefore, 0.12 in standard form = 1.2 x 10-1
The -1 implies multiplying the 1.2 by 0.1. Hope I haven't confused you?!
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The way you wrote it is the standard form.
Writing a number in standard form simply means to express the number in its 'normal' form. Therefore, your example is written in standard form as: 0.015
Example: 2 (I don't know how to do an exponent on the computer so I'll just say what you would say out loud) to the 4th power= 2x2x2x2=16. <- that's standard form.
Eight million eight thousand in standard form is 8,800,000. If you want to write that in scientific notation, then you would say 8.8 x 106
This number is called a quattuorvigintillion, and it is equal to 1099 in the United States.