There always has to be one digit before the decimal point, which in this case is 6.
Then you round the rest of the number into two digits (in this case 00).
So it would be 6.00.
Then work out how many times you must multiply this by ten to make the original number, which is twice, so 102:
6.00 x 102
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600,000,000,000
The standard form is written as 411,725,600
600,323,210,000
The standard form is 28,600,000
The standard from of 600 thousandths is: 6.0 × 10-1