Writing a number in standard form simply means to express the number in its 'normal' form. Therefore, your example is written in standard form.
0.480
It is 2.408
That IS the standard form.
0.408 In the above number, the "4" holds the tenths position, the "0" to its right holds the hundredths position, and the "8" holds the thousandths position.
You write 20.7 in standard form as: 2.07 × 101
One hundred eight thousandths (0.108) in standard form is 1.08 × 10-1
two and four-hundred eight thousand
2.408
408
0.480
It is 2.408
Expressed in decimal form, 408/10000 = 0.0408
425 and 32 thousandths in standard form is: 425.032
How do write 666 in standard form?
It is already in standard form.
That is the standard form!
That is the standard form.