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# Rounding whole numbers: missing digit

Lindsay finds the missing digit in an estimation problem by using a number line.

## Want to join the conversation?

• To be honest, the number line makes me more confused. Can someone help me?
• 4_20? The missing digit has to be 5 or greater. I hope this helped.
• I do not understand i need help
• OK, so you have the number 4?29 and you have to work out how many different digits that could replace the question mark, while the statement '4?29 rounds to 5000' stays true. (As the nearest thousand.) First think about all the digits you could put there, 1, 2, 3, 4, 5, 6, 7, 8, 9, 0.

Now think about which digits wold still make the statement '4?29 rounds to 5000 true'.

Does 4029 round to 5000 as its nearest thousand, No.
Does 4129? No
Does 4229? No
Does 4329? No
Does 4429? No
Does 4529? Yes
Does 4629? Yes
Does 4729? Yes
Does 4829? Yes
Does 4929? Yes

All the digits from 5-9 (Inclusive) will keep the statement true, while the digits from 0-4 (Inclusive) will not.

I really hope this has helped you! :-)
Science123
• Let us consider a decimal number 899.48. If I want to round this number to a whole number, first option is 899.48---> 899.5--->900
The second option is 899.48 ---> 899 (since the number in the tenths place is not equal to or higher than 5)
Which one is right and why?
• The second one is right. When rounding, only consider the number before what you're rounding up or down to.
• is any body bored
• If life is unfair to everyone, doesn't that make it fair?
• I know this might be a retholical question which might not need my answer, but...

It is fair in the sense that everyone is not left behind with the "unfairness", but it is not fair in the amount or form of unfairness which one may receive.
• why is this so LONG
• Let us consider a decimal number 899.48. If I want to round this number to a whole number, first option is 899.48---> 899.5--->900
The second option is 899.48 ---> 899 (since the number in the tenths place is not equal to or higher than 5)
Which one is right and why?
• 899.48 rounded to the nearest whole number is 899, because the digit in the tenths place is less than 5.

Also, it is 48 hundredths away from 899, but 52 hundredths away from 900, so it's clearly closer to 899.

899.48 → 899.5 → 900 doesn't round 899.48 to the nearest whole number.
Instead it rounds 899.48 to the nearest tenth, and then it rounds that number (899.5) to the nearest whole number.