The same as any other number. Look one place to the right of the place you want to round up to. If that digit is 4, 3, 2, 1 or 0, get rid of it. If that digit is 5, 6, 7, 8 or 9, increase the place to the left of it by one and get rid of the rest.
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to find a low estimate for the product of two decimals, round both factors
4 decimals: 1.0033 3 decimals: 1.003 2 decimals: 1.00
5229 to the nearest thousandth is simply 5229. There are no decimals to round. But if you meant "thousand", then it is 5000 because the "229" is below the cutoff of "500" (in which case you would round up). If it were 5500 or more, you would round to 6000.
Decimals with at least .5 rounds up. Decimals with at the greatest .49 round down. 1.5 rounds up, so the nearest whole number is 2. * * * * * Nearly there, but not quite. The above does not say what happens to 0.497, for example. Actually, a rule that always rounds up .5 introduces an upward bias, and a better rule is to: round down any number less than .5 round up any number greater than .5 and, if the number is .5, then round up or down so that the last [non-zero] digit is EVEN.
6.7495 to 2 decimal places: 6.75 (because 6.[7495] - 74 are the 2 decimals, but 95 is over 50, so you round it up to 75[00])