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Using the vertical subtraction, make sure the numbers are written with the decimal points aligned.
Put a decimal point in the answer immediately under the other two decimal points.
If there are not enough digits after the decimal point in the top number, zeros can be appended (added to the right hand end) without changing its value.
Now subtract the numbers like normal, the decimal point can be treated as a mark on the page during this.
Read the answer, including the decimal point.
Example: 51.8 - 2.96:
__ 51.80
___ 2.96
__-------
__ 48.84
⇒ 51.8 - 2.96 = 48.84
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What is the rule for significant figures when adding or subtracting decimals?
When adding and/or subtracting, your answer can only show as many decimal places as the measurement having the fewest number in the decimal places.
What is the definition of subtracting decimals?
You subtract decimals together.
When adding and subtracting decimals will your answer be a mixed number?
Yes
When adding and subtracting decimals you must?
add them or subtract them, as appropriate!
When adding or subtracting decimals always do what?
First you write the decimals one under the other, in such as way that the decimal points are aligned.
