16.454 is greater. If you write the full numbers in the thousandths column, 16.45 is 16.450. It can be clearly seen that 16.454 is greater by 4 thousandths.
The number 16.454 is greater than 16.45. This is shown by comparing each digit in their decimal places. The value of 16.454 exceeds that of 16.450 by 4 thousandths.
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