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Q: Why it is important to line up decimal numbers by their play value when you add or subtract them?

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explain why it is important to line up decimal numbers by their place value when you add or subtract them

It is the same reason that when adding whole numbers, they are all aligned to the right. It is so that columns of numbers are aligned according to their place value.

It isn't really that important, it just makes the problem solving easier and gives you less of a chance of making 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.

Almost all numbers that we use in daily life are decimal numbers. The place value of each digit is ten times the place value of the digit to its right. And that is all that is required of decimal numbers. A decimal point is not necessary.

It is important to add and subtract integers: to get a new integer value in mathematics .

1.20 has the same value as 1.2 and they are both decimal numbers

By the signs: 2+2(Add) 2-2(Subtract) +=add -=subtract

Compatible Numbers are numbers that are close in value to the actual numbers and easy to add, subtract, multiply or divide mentally

add the three numbers the subtract 180 from your sum

They are written as numbers usually are. The place value of the digit immediately to the left of the decimal point is ones and the place value of all other digits is ten times the value of the digit to their right.

Subtract the absolute value of the smaller number from the absolute value of the larger number. The answer will have the sign of the larger numbers.

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.

9 and 3 are in the 14th and th decimal place for the value of pi.

A decimal number is one way of representing numbers where each place for a digit has a place value that is ten times that of the place to its right. Most all the numbers that you familiar with (judging from your question) will be decimal numbers. A decimal number need not be a [decimal] fraction.

Place Value Charts help you because they put the decimal in the right place.

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yes

A decimal is a way of representing a number. There is no number after a number.A decimal is NOT a decimal point.

The decimal point is just a point. It has no numbers or value associated with it!

The range is the largest value minus the smallest value from a set of numbers.

It is 400. Decimal refers to a way of representing numbers in which the place value of each digit is ten times the place value of the digit to its right. Decimal does not require a decimal point nor trailing zeros.

3.1415926

They are fractions of a centimetre.

No. Positive numbers can be whole numbers but they can also be decimal numbers and fractions. If a value is a whole number, it does not have a fraction or decimal part and it is not negative. Whole numbers are also called natural numbers or counting numbers.