The greatest value in 840 is the 8. The greatest place value is the hundreds place. When rounding to a specific place, take a look at the digit immediately to the right of the target, in this case, the tens place. If that digit is 4 or less, zero everything to the right of the target out. If that digit is 5 through 9, increase the target by one and zero everything to the right of it out. If the target is a 9, increasing it will turn it to zero and increase the digit to the left of the target by one.
849 rounds to 800, which makes sense because 849 is closer to 800 (49 away) than it is to 900 (51 away).
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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.
800
When rounding 849 to the nearest hundred, you look at the digit in the tens place, which is 4. Since 4 is less than 5, you round down. Therefore, 849 rounded to the nearest hundred is 800.
800
849 has 8 hundreds, 4 fewer tens than hundreds, and 5 more ones than tens.