4.5 is in standard form, unless you're in Britain where you use what people in the US call scientific notation where 4.5 can be written as 4.5 x 10^0 or just plain 4.5
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One and 45 ten-thousandths in standard form = 1.0045 × 100
The standard form is written as 45,070,200
How do write 666 in standard form?
It is already in standard form.
That is the standard form!