As a product of its prime factors in exponents: 2^3 times 5^3 = 1000
0.003 as a fraction is 3/1000
The decimal fraction for 3.588 would be 3.588/1000
You write it as 1000.00
0.077 can be written as 'seventy-seven thousandths' or 77/1000 or 7.7%
548/1000
10^4
You can write it as 103. That would be the most common way, but there's many other correct ways to write it.
23*53 = 1000
23 x 53
I would say they are in standard form, but I would be more likely just to ask you to write a simplified number without using exponents. The terminology can vary, but the following example shows the usual names: 1,023 is in standard form. One thousand twenty-three is in word form. 1000 + 20 + 3 is in expanded form.
2 to the 3rd power times 5 to the third power
103
They are in exponents: 23*53 = 1000
10x10x10
Expressed in numerical form, 30 15/1000 is equal to 30.015.
9081/1000
7/1000 as a percent would be 0.7%