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Why do you line up the decimal when adding or subtracting decimal numbers?
Wiki User
∙ 12y ago
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.
Wiki User
∙ 12y ago
Anonymous
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What would happen if you didn't line up the decimal point will adding and subtracting?
You are more likely to make a mistake.
How is adding on number line different from subtracting on a number line?
When subtracting, the number moves to the left (negative direction). When adding, the number moves to the right (positive direction).
When subtracting a negative number why do you move to the right on the number line instead of the left?
Subtracting a negative number is the same as adding a positive number. Also, adding a negative number is the same as subtracting a positive number. -7 + (-5) = -7 - 5 = -12 -7 - (-5) = -7 + 5 = -2
Explain why it is important to line up decimal numbers by their place value when you add or subtract them?
explain why it is important to line up decimal numbers by their place value when you add or subtract them
What are 5 numbers that are not integers?
Integers include positive whole numbers, negative whole numbers, and zero.The "set of all integers" is often shown like this:Integers = {… -5, -4, -3, -2, -1, 0, 1, 2, 3, 4, 5, …} The dots at each end of the set mean that you can keep counting in either direction. The set can also be shown as a number line:The arrows on each end of the number line mean that you can keep counting in either direction.Adding and Subtracting IntegersLooking at a number line can help you when you need to add or subtract integers.Whether you are adding or subtracting two integers, start by using the number line to find the first number. Put your finger on it. Let's say the first number is 3.Then, if you are adding a positive number,move your finger to the right as many places as the value of that number. For example, if you are adding 4, move your finger 4 places to the right. 3 + 4 = 7If you are adding a negative number, move your finger to the left as many places as the value of that number. For example, if you are adding -4, move your finger 4 places to the left. 3 + -4 = -1If you are subtracting a positive number, move your finger to the left as many places as the value of that number. For example, if you are subtracting 4, move your finger 4 places to the left. 3 - 4 = -1If you are subtracting a negative number, move your finger to the right as many places as the value of that number. For example, if you are subtracting -4, move your finger 4 places to the right. 3 - -4 = 7Here are two rules to remember:Adding a negative number is just like subtracting a positive number. 3 + -4 = 3 - 4Subtracting a negative number is just like adding a positive number. The two negatives cancel out each other. 3 + 4 = 3 - -4
When adding or subtracting decimals the decimal point must be in line for all numbers?
Yes.
Why it is important to line up decimal numbers by their play value when you add or subtract them?
This is true for adding and subtracting ALL numbers, not just decimal representations.
Why is it important to line up the decimal points when adding or subtracting but not when multiplying?
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.
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 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 does place value has to do with adding and subtracting?
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.
What would happen if you didn't line up the decimal point will adding and subtracting?
You are more likely to make a mistake.
When adding or subtracting decimal how can you be sure to add or subtract only digits that have the same place value?
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 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. :)
How is adding on number line different from subtracting on a number line?
When subtracting, the number moves to the left (negative direction). When adding, the number moves to the right (positive direction).
Why do you line up the decimal points when adding and subtracting?
you have to line up the decimal points because you need to keep each place value in the same column so when you add or subtract you wont make any errors
Why it is important to line up decimal numbers?
Because 42.0+7.8 is different from adding 42+78. it makes adding easier!
