If you're seeing this message, it means we're having trouble loading external resources on our website.

If you're behind a web filter, please make sure that the domains *.kastatic.org and *.kasandbox.org are unblocked.

### Course: Class 6 (Foundation)>Unit 1

Lesson 4: Rounding numbers

# Rounding whole numbers: missing digit

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

## Want to join the conversation?

• 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.
• 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.
• I made a song called the Rounding song

look next door 5 or greater
numbers in the front say there name
numbers in the back zeros there name
• how does 4529 round to 5000 doesnt it round to 4000
• it is because 1,2,3 and 4 round down while 5,6,7,8 and 9 round up.
• I don't have a question, I have a comment, you guys should ask people if they need the video & ask questions about the video. Like if somebody needs help with their fractions, you can ask them questions like,
. Are fractions easy for you?
. Do you know what 6/10 are?
And etc.
• can someone help me i do not understand?
• I answered my answer (me realized that sounds weird and sorta like a tongue twister but totally don't change it.) Anyways I answered a whole essay, a whole essay that could be longer than a Khan Academy video trying to explain it. It is in the comments. Idk what you did not understand but I tried my best to solve it. I hope it clarified your questions. If not tell me more Specifically what your question is. `It would be easier to answer your question if I knew what it is. Thank you`
• I wish she didn't use the number line. Why can't she just draw it on the board?