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## 5th grade

### Unit 1: Lesson 7

Rounding decimals- Rounding decimals on the number line
- Round decimals using a number line
- Worked example: Rounding decimals to nearest tenth
- Round decimals
- Understand decimal rounding
- Rounding decimals word problems
- Round decimals word problems
- Decimal place value: FAQ

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# Worked example: Rounding decimals to nearest tenth

CCSS.Math:

Rounding decimals to the nearest tenth can be fun. We can identify the tenths place in the given decimal, 9.564. Then we can look at the digit to the right of the tenths place to determine whether to round up or down. In this case, the answer is to round up to 9.6. Created by Sal Khan and Monterey Institute for Technology and Education.

## Want to join the conversation?

- why isn't there a twentyeths place??(3 votes)
- That's because decimals are base ten.(25 votes)

- how do u round Round 74.724 to the nearest hundredth(5 votes)
- Do it like Sal said: the two is in the hundredth place, so look at the four on the right of it. Four is lower than five, so round down. 74.724 becomes 74.72 when rounded to the nearest hundredth.(30 votes)

- hello.... I have couple of questions 1. You round to one place lower so in thousenths place u round up to place next like .5634 so we round to .563 4 is not considered ? 2. In number lines how do u round like how u write the digits is it like .1 to .9 ? 3. I'm having problems with rounding up in thousenths place mostly

thank you(6 votes)- Hello! Hopefully the following answer addresses your 1st and 3rd questions. Unfortunately, I'm not quite sure what you mean by "In number lines how do you round like how you write the digits". Number lines can start and end at any number and have markers at any set distance (1, 0.5, 0.1, etc.). If you can rephrase the question, maybe I can help!

The digits to the right of the decimal point are the **tenths** place,*hundredths*place,*thousandths*place, and*ten-thousandths*place (remember there's no "onethes" place!). In 0.5634, the**3**is in the**thousandths**place. When you round to the nearest thousandth, you meant that you want to end up with 0.56#, where you have to figure out what should go in the # place. You figure that out by considering the 4 in the ten-thousandths place.

If you had 34 and wanted to round to the nearest tens place, you'd say "4 is less than 5, so I'll round down" and end up with 30. The same applies here: 4 is less than 5, so you round down, and end up with 0.563. Considering the 4 is how you get 0.563 instead of 0.564!(14 votes)

- If I have 5.1897 and I'm rounding to the nearest thousandth what do I do? What does the 9 turn into and how is that effecting the rest of the numbers(2 votes)
- For your example, in this case 9 is in the thousandths place. To the right of 9 is 7, which is 5 or greater. Here, 9 becomes 0 and you add 1 to the 8 which becomes 9. Therefore, 5.1897 is rounded to 5.190.(2 votes)

- i have a quick question how did you find out to round up or down.(3 votes)
- If the next number is less than 5, round down. If the number is 5 or over, round up.(3 votes)

- what is 63.99 rounded to the nearest 10(3 votes)
- Rounded to the nearest 10, 63.99 would become 60.

Remember this rule - less than five you round down - five or greater you round up, so 63 rounds down. If it was 65, you would round UP to 70.(3 votes)

- When you have a question for example;

1267.9876 Round to the nearest hundred.

It would = 1300, why do you have to get rid of the 6,7 and also the decimal points?(3 votes)- Because 6 and 7 are larger than 4, so you must round them up. You get rid of the decimal points because 9,8,7 and 6 are all larger than 4. However, even if it was "round 1267.1234 to the next hundred, it would still be 1300. Why? Well, you must always look for the "decider". What is this? Well, the decider is the number that decides what the number you are rounding will be. For example, when rounding 1643 to the nearest hundred, the decider would be 40. If it was 1643 rounded to the nearest thousand, then the decider would be 600. If... well, you get the idea! :)(3 votes)

- is there such thing as rounding to the thousandths place? PLEASE HELP ME I WOULD REALLY LIKE THAT THANKS(2 votes)
- It's a thing if i'm rounding 92.3345 to the thousandths it will be 92.335.... im rounding up(1 vote)

- after the decimal point does it start at oneth or tentes and how can you tell what place it it behind the decimal....(2 votes)
- how do you do the rounding to the nearest 100(3 votes)
- Be more specific. do you mean hundredths? if so, you do exactly what Sal said if its 5 or more round up or 4 or less you round down.(2 votes)

## Video transcript

Round 9.564, or nine and
five hundred sixty-four thousandths, to the
nearest tenth. So let me write it a little
bit larger, 9.564. And we need to round to
the nearest tenth. So what's the tenth place? The tenths place
is right here. This right here represents
5 tenths. This is the ones place, this is
the tenths place, this is the hundredths place,
and this is the thousandths place right here. So we need to round to
the nearest tenth. So if we round up,
this will be 9.6. If we round down, this
will be 9.5. And just like regular rounding,
when we're not dealing with decimals, you move
to one spot, or you look at one place to the right or one
place lower, I guess, and you say is that 5 or larger? If it is, you round up, if
it isn't, you round down. 6 is definitely 5 or larger,
so we want to round up. So this 9.564 becomes 9.6,
or we can call this nine and six tenths. And then we're done!