While writing the point (period symbol) may not be legible and so zero is added. It is still possible to have an illegible point (period sign). Just another safety mechanism. Also used to line up digits during mathematical operations.
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You can, for example 0.009 is the same as .009. I have been taught to put a zero before the decimal but it depends. To be safe i would put a zero before the decimal. 000.009 you could take 2 zeros off the beginning but leave one. Hope this helps!
0.51
Decimal point zero four is not equal to decimal point four zero..04 = 4/100.40 = 4/10thus, .04 < .40
decimal system and zero are the contribution of the Indians to the humanity.
1.556621881 rounded to zero decimal place = 2