No, it is not necessary. But it does help to be tidy.
no
you only line the decimals up when you are subtracting or adding not when you are multiplying im not sure about division...
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.
Because left of the decimal point goes times 10 for every position and right of the decimal point goes times -10 for every position.
No, it is not necessary. But it does help to be tidy.
line up the decimals together
no
technically you don't line up the ones. you line up the decimals. you do this because it is necessary to compare place value to place value in order to order.
You need to line up decimals for additional and subtraction. For multiplication, you don't need to line them up - in fact, it would serve no useful purpose.
Just make sure you line up the decimals
Yes!
Yes. Line up them up when you're adding, too.
39.63 +42.35 ------------ 81.98 Just line up the decimals and then add.
line up the demials
you only line the decimals up when you are subtracting or adding not when you are multiplying im not sure about division...
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.