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Round decimals
Rounding decimals is very much like rounding whole numbers. We will round decimals with a method based on the one we used to round whole numbers.
We summarize the steps for rounding a
decimal here.
Round decimals.
- Locate the given place value and mark it with an arrow.
- Underline the digit to the right of the place value.
- Is this digit greater than or equal to 5?
- Yes—add 1 to the digit in the given place value.
- No—do
not change the digit in the given place value.
- Rewrite the number, deleting all digits to the right of the rounding digit.
Add and subtract decimals
To add or subtract decimals, we line up the decimal points. By lining up the decimal points this way, we can add or subtract the corresponding
place values . We then add or subtract the numbers as if they were whole numbers and then place the decimal point in the sum.
Add or subtract decimals.
- Write the numbers so the decimal points line up vertically.
- Use zeros as place holders, as needed.
- Add or subtract the numbers as if they were whole numbers. Then place the decimal point in the answer under the decimal points in the given numbers.
Solution
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Multiply and divide decimals
Multiplying decimals is very much like multiplying whole numbers—we just have to determine where to place the decimal point. The procedure for multiplying decimals will make sense if we first convert them to fractions and then multiply.
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Source:
OpenStax, Elementary algebra. OpenStax CNX. Jan 18, 2017 Download for free at http://cnx.org/content/col12116/1.2
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