100
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It is 1000.
It is 72.
To round a number to a certain place value, you look at the digit immediately to the right of that place value. If it is 5 or greater, you round up; if it is less than 5, you round down. For example, to round 3.785 to the nearest hundredth, you would look at the digit in the thousandths place (8), which is 5 or greater, so you round up to 3.79.
To round 4399 to the greatest place value, you need to look at the digit in the thousands place, which is 4. The next digit to the right is 3, which is less than 5, so the thousands place remains the same. Therefore, rounding 4399 to the greatest place value would result in 4000.
That's correct if rounding to the second greatest place value, but not the greatest. The greatest place value in a three digit number is the hundreds place. 849 rounded to the nearest hundred is 800.