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Because if you don't line them up by the decimal, you could see a 9-3, when in fact it could be 9-30 or 90-3 accidentally. Mistakes happen. best to keep it simple

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Q: Why do you line up decimals when you subtracting?
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Related questions

Do you line decimals up when subtracting?

Yes!


When do you line up the decimal?

you only line the decimals up when you are subtracting or adding not when you are multiplying im not sure about division...


What do you do when you add or subtract decimals?

Adding and subtracting decimals is easy. When you put the numbers one above the other, line up the decimals vertically and treat as you would any whole number just keep the decimals in line and bring it straight down to your answer.


What are the three rules of adding and subtracting decimals for 5 grade?

line up the decimal point when your adding and subtracting. add annex a zero when you have extra number. sometimes you can use a number line.


When adding or subtracting decimals the decimal point must be in line for all numbers?

Yes.


What is the definition of subtracting decimals?

You subtract decimals together.


When multiplying decimals with whole numbers do you line up the whole numbers?

Hey awesome Question. The answer is no you do not have to line up the decimals when multyping only when adding and subtracting. The main thing is when you multiply make sure you put the decimal in the right place in your answer. YOu count how may places their are behind the decimals in BOTH numbers then you make sure their are that many places behind the decimal in you answer. :)


Why do you line up the decimal when adding or subtracting decimal numbers?

Yes, When Adding and Subtracting decimals you should line up the decimals. You need to keep each place value in the same column, the same as when you add whole numbers you keep the ones column lined up, same for the tens, etc. Lining up the decimal points makes sure that the tenths column is kept together, same for the hundredths, and so on.


Do decimal points need to be lined up when adding and subtracting decimals?

Yes, unless you are an expert.


How do you add decimals step by step?

line up the decimals together


Do you line up decimals when you multiply?

no


Math subtracting decimals?

Ninja valentines