How do I round off to the nearest 10, 100, 1000 and nearest one hundredth and nearest whole number
http://www.helpingwithmath.com/by_subject/place_value/rounding.htm
Read carefully.
AND
http://www.ixl.com/math/grade-2/round-to-nearest-ten-hundred-or-thousand
A place to practice.
To round off a number to the nearest 10, 100, or 1000, you need to consider the digit in the place value that you want to round to. Here's how you can round off to the nearest 10, 100, and 1000:
1. Rounding to the nearest 10:
- Identify the digit in the ones place (rightmost digit).
- If the digit in the ones place is 0-4, drop all the digits to the right of it and keep the digit as it is. For example: 43 rounded to the nearest 10 is 40.
- If the digit in the ones place is 5-9, increase the digit by 1, drop all the digits to the right of it, and replace them with zeros. For example: 47 rounded to the nearest 10 is 50.
2. Rounding to the nearest 100:
- Identify the digit in the tens place (second rightmost digit).
- Follow the same procedure as rounding to the nearest 10, but consider the tens place digit.
- For example: 245 rounded to the nearest 100 is 200, and 387 rounded to the nearest 100 is 400.
3. Rounding to the nearest 1000:
- Identify the digit in the hundreds place (third rightmost digit).
- Follow the same procedure as rounding to the nearest 10, but consider the hundreds place digit.
- For example: 3,876 rounded to the nearest 1000 is 4,000.
To round off to the nearest one hundredth (0.01), you need to consider the digit in the second decimal place. Here's how you can do it:
1. Rounding to the nearest one hundredth:
- Identify the digit in the second decimal place.
- If the digit in the second decimal place is 0-4, drop all the digits to the right of it and keep the digit as it is. For example: 3.458 rounded to the nearest one hundredth is 3.45.
- If the digit in the second decimal place is 5-9, increase the digit in the first decimal place by 1, drop all the digits to the right of it, and replace them with zeros. For example: 2.869 rounded to the nearest one hundredth is 2.87.
To round off to the nearest whole number, you can follow the same procedure as rounding off to the nearest 10, but consider the ones place digit. For example: 3.6 rounded to the nearest whole number is 4, and -2.3 rounded to the nearest whole number is -2.