The normal convention when rounding numbers if to "round up" if the last decimal place is 5 or more or "round down if it is 4 or less eg. 5.55 would become 5.6 and 5.54 would become 5.5
3.999 includes 3 decimal places (the numbers after the "."), each of which would round up - so when rounded up to one decimal place it would become 4.0
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Well, isn't that a happy little number! When we round 3.999 to 1 decimal place, it becomes 4. Remember, rounding is like giving a little hug to a number to make it simpler and easier to work with. Just embrace that rounded number and let it bring a smile to your calculations.
27.60 rounded to one decimal place is 27.6. The first digit to the right of the . is the tenth.
What is 376.991 to 1 decimal place
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.
When rounding 3999 to the nearest thousands, we look at the hundreds place, which is a 9 in this case. Since 9 is greater than or equal to 5, we round up. Therefore, 3999 rounded to the nearest thousands 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.