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In this case with 234.896 the last digit, '6' determines the precision since in is the last non-zero digit.
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If a number is given to the true degree of precision, this is always determined by its last digit - in this case, 6.
Always the last number, so in this example the precision is to hundredths.
None of them, you do that! You have given it to the precision of 3 decimal places or 6 significant figures however.