If you mean what i think you mean then it's really easy. 1.25m = 1.25 * 1,000,000 = 1,250,000
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125,000,000 = one hundred twenty-five million or 125 million
Writing a number in standard form simply means to express the number in its 'normal' form. Therefore, your example is written in standard form.
0.125 is a fractional number in decimal form and there is no sensible way to represent it as a whole number.
It is: 2 and 8/1000 or as 2 and 251/125 in its simplest form
21/125