It is: 4000 because 40*100 = 4000
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To round off 3999 to the nearest hundred, you would look at the digit in the tens place, which is 9. Since 9 is greater than or equal to 5, you would round the hundreds place up by 1. Therefore, 3999 rounded to the nearest hundred is 4000.
You look at the number in the hundreds place and if it's greater than or equal to 5, you round up and if it's less than or equal to 4, you round down. Since 9 is greater than 5, you round 3999 up to 4,000.
7000
549 and 450 rounded off the nearest hundred is 500
86 rounds to 100