Because when adding or subtracting, the operations must take account of the place values of individual digits in the numbers. When multiplying, only the overall order of magnitudes are relevant for placing the decimal point in the product.
Yes.
The simplest way is to line up the numbers so that their decimal points are aligned, and corresponding digits are also aligned according to their place value.
This is true for adding and subtracting ALL numbers, not just decimal representations.
The simplest way is to line up the numbers so that their decimal points are aligned, and corresponding digits are also aligned according to their place value.
Because when adding or subtracting, the operations must take account of the place values of individual digits in the numbers. When multiplying, only the overall order of magnitudes are relevant for placing the decimal point in the product.
Yes.
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.
you only line the decimals up when you are subtracting or adding not when you are multiplying im not sure about division...
You line the number up, vertically, so that the decimal points are one below the other.
You are more likely to make a mistake.
The simplest way is to line up the numbers so that their decimal points are aligned, and corresponding digits are also aligned according to their place value.
This is true for adding and subtracting ALL numbers, not just decimal representations.
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.
The simplest way is to line up the numbers so that their decimal points are aligned, and corresponding digits are also aligned according to their place value.
When subtracting, the number moves to the left (negative direction). When adding, the number moves to the right (positive direction).
It stops you from adding tens to hundreds, or subtracting thousands from millions. The place value is used to line up columns correctly to ensure that the correct values are being used. The decimal point is the deciding factor in locating the proper numbers.