· Round totality numbers to specific place values, consisting of tens, hundreds, and thousands.
You are watching: What is 80 rounded to the nearest ten
In part situations, you nothing need precise answer. In these cases, rounding the number come a certain place value is possible. For example, if you travelled 973 miles, you can want to ring the street to 1,000 miles, i m sorry is easier to think about. Rounding likewise comes in comfortable to check out if a calculate is reasonable.
These space the rule for rounding whole numbers:
First, recognize the digit with the ar value to which you space rounding. You can circle or highlight the number so friend can focus on that better.
Then, recognize the feasible numbers the you would obtain by rounding. These possible numbers room close come the number that you’re round off to, however have zeros in the number to the right.
If you space rounding 186 come the nearest ten, then180 and 190 are the two possible numbers to ring to, together 186 is in between 180 and also 190. However how carry out you understand whether to ring to180 or 190?
Usually, round a number come the number the is closest to the initial number. When a number is halfway between the two feasible numbers, round approximately the higher number. |
Since 186 is in between 180 and 190, and 186 is closer to 190, girlfriend round as much as 190.
You have the right to use a number line to help you ring numbers.
Example | ||
Problem | A camera is dropped out of a boat, and also sinks to the bottom the a pond the is 37 feet deep. Ring 37 to the nearest ten. | |
37 | The number you’re rounding to is the tens digit, 3. | |
30 37 40 | 37 is between 30 and also 40. | |
37 is just 3 far from 40, yet it’s 7 away from 30. So, 37 is closer come 40. | ||
Answer to the nearest ten, 37 ring to 40. | ||
Example | ||
Problem | Round 33 to the nearest ten. | |
33 30, because 33 is closer come 30. | ||
Answer | To the nearest ten, 33 ring to 30. | |
You can determine whereby to round without utilizing a number line by looking in ~ the digit to the best of the one you’re round off to. If that digit is much less than 5, round down. If it’s 5 or greater, round up. In the example above, you deserve to see there is no a number line that 33 is rounded come 30 since the persons digit, 3, is much less than 5.
Example | ||
Problem | Round 77 to the nearest ten. | |
77 80, since the people digit, 7, is 5 or greater. | ||
Answer | 77 rounded come the nearest ten is 80. | |
Example | ||
Problem | There are 576 jellybeans in a jar. Round this number come the nearest ten. | |
576 580, due to the fact that the persons digit, 6, is 5 or greater. | ||
Answer | 576 rounded to the nearest ten is 580. | |
In the vault examples, friend rounded come the tens place. The rounded numbers had actually a 0 in the ones place. If you round to the nearest hundred, the rounded number will have zeros in the tens and ones places. The rounded number will certainly resemble 100, 500, or 1200.
Example | ||
Problem | A runner ran 1,539 meters, but describes the street he ran v a rounded number. Ring 1,539 come the nearest hundred. | |
1,539 1,500, because the next digit is less than 5. | ||
Answer | 1,539 rounded come the nearest hundred is 1,500. | |
If you ring to the nearest thousand, the rounded number will have zeros in the hundreds, tens, and also ones places. The rounded number will resemble 1,000, 2,000, or 14,000.
Example | |
Problem | A plane’s altitude raised by 2,721 feet. Ring this number to the nearest thousand. |
2,721 3,000, because the next digit, 7, is 5 or greater. | |
Answer 2,721 rounded come the nearest thousand is 3,000. |
Now the you know just how to round to the nearest ten, hundred, and also thousand, shot rounding to the nearest ten thousand.
Example | ||
Problem | Round 326,749 to the nearest ten thousand. | |
326,749 330,000, because the following digit, 6, is 5 or greater. | ||
Answer | 326,749 rounded come the nearest ten thousands is 330,000. | |
A record variety of 23,386 human being voted in a city election. Ring this number to the nearest hundred. A) 23,300 B) 23,400 C) 23,000 D) 23,390 Show/Hide Answer A) 23, 300 Incorrect. The two feasible numbers are 23,300 and 23,400, but 23,386 is closer to 23,400. The 10s digit, 8, is 5 or greater so you have to round up. The correct answer is 23,400. B) 23,400 Correct. The two possible numbers room 23,300 and 23,400, and 23,386 is closer to 23,400. The 10s digit, 8, is 5 or higher so you have to round up. C) 23,000 Incorrect. This number is rounded to the nearest thousand, no the nearest hundred. The correct answer is 23,400. D) 23,390 Incorrect. This number is rounded come the nearest ten, not the nearest hundred. The correct answer is 23,400. Summary In instances when you don’t need an exact answer, you can round numbers. Once you round numbers, you are constantly rounding come a particular place value, such together the nearest thousand or the nearest ten. Even if it is you round up or round under usually relies on which number is closest to your original number. When a number is halfway between the two possible numbers, round approximately the larger number. |