Assuming you do mean to the nearest hundred, answer the question 'is this number closer to 5400 or 5500?' It is closer to 5400 (The first digit to the left of the decimal point is 'ones', the second place is 'tens', the third place is 'hundreds', so you look at the third digit to the left to round to the nearest hundred) If, in fact, you meant hundredth, answer the question 'is it closer to 5403.26 or 5403.27?' It is closer to 5403.26 (The first digit to the right of the decimal point is 'tenths', the second digit is 'hundredths', so you look at the second digit to the right to round to the nearest hundredth)
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Assuming you do mean to the nearest hundred, answer the question 'is this number closer to 5400 or 5500?' It is closer to 5400 (The first digit to the left of the decimal point is 'ones', the second place is 'tens', the third place is 'hundreds', so you look at the third digit to the left to round to the nearest hundred)
If, in fact, you meant hundredth, answer the question 'is it closer to 5403.26 or 5403.27?' It is closer to 5403.26 (The first digit to the right of the decimal point is 'tenths', the second digit is 'hundredths', so you look at the second digit to the right to round to the nearest hundredth)