The hundredth is the second decimal place. You know the rounding rules are where you look at the previous place and if it's 5 or above the number place your rounding to goes up. So the answer is 423.41
423.408 = 423.41 0.08 is nearer to 0.1 than 0.001
To round 423.408 to the nearest hundredth, we find the hundredths place, which is '0'. Since the next digit is '8', which is greater than 5, we round '0' up to '1', resulting in 423.41.
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