Writing a number in standard form simply means to express the number in its 'normal' form. Therefore, your example is written in standard form.
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That is the standard form.
It is already in decimal form as 9.2103
Decimal form is 4.026. Standard form is 4 26/100.
There is only standard form for decimalisation - no other option.
51 billion in decimal or standard form is 51,000,000,000