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usually the largest on the top row of the sum, then the middle, then the smallest, makes a tidier arrangement

Q: How do you line up decimals when adding 3 numbers?

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Yes. Line up them up when you're adding, too.

line up the demials

39.63 +42.35 ------------ 81.98 Just line up the decimals and then add.

1. When adding, the decimals MUST line up: 012.3 +32.1 2. When multiplying, you dont have to put the decimals side by side: 12.3 x323.55 Then you count how many numbers are after the decimals, which, in this case, is three. Hope it helped!

you can line up the decimals

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Because you could mess up and add the wrong numbers together.

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.

Yes. Line up them up when you're adding, too.

line up the demials

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. :)

39.63 +42.35 ------------ 81.98 Just line up the decimals and then add.

When adding numbers with decimals always make sure the decimal points are lined up. That is the only way to be sure that the person will be adding them up right.

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

1. When adding, the decimals MUST line up: 012.3 +32.1 2. When multiplying, you dont have to put the decimals side by side: 12.3 x323.55 Then you count how many numbers are after the decimals, which, in this case, is three. Hope it helped!

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.

you can line up the decimals

That is because if you don't, you will get the wrong answer. It is ALWAYS important to LINE up the decimals.