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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.

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Q: When adding or subtracting decimals how can you be sure to add or subtract only digits that have the same place value?
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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.


How do you estimate using front-end estimation?

by adding or subtracting the values of the digits in the front place


How do you subtract using regrouping?

"Regrouping" is a more modern word for "borrowing". When subtracting with decimals, if you are trying to subtract a larger digit from a smaller digit, you "regroup" the next digit to the left by taking one away from it and adding 10 to the number you are subtracting from. Example 84 - 19 _____ You can't subtract 9 from 4, so you take one away from the next digit over (the 8) and add 10 to the 4. 14 - 9 is 5 in the ones digits 7 - 1 is 6 in the tens digits Now if you are subtracting mixed numbers, the regrouping process is essentially the same, except that instead of always regrouping by tens, we regroup by the denominator size. 8 1/5 - 3 3/5 ______ We can't subtract 3/5 from 1/5, so we regroup one unit from the 8 into 5 fifths. 7 6/5 -3 3/5 _______ 4 3/5 It is very easy when you get some practice doing it.


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.


When multiplying decimals count the decimals digits in each?

Yes.

Related questions

How do you do subtracting fractions with regrouping?

You do by subtracting one from the previous number and adding 10 to the top number of the digits you are regrouping. Subtract those two digits and you should get your answer.


When adding or subtracting decimals how many digits should the answer contain?

as many as needed to satisfy the accuracy needed.


When adding and subtracting decimalshow can you be sure to add or subtract only digits that have the same place value?

You line the number up, vertically, so that the decimal points are one below the other.


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.


What must each number have when adding and subtracting scientific numbers?

same number of significant digits


How do you estimate using front-end estimation?

by adding or subtracting the values of the digits in the front place


How do you subtract using regrouping?

"Regrouping" is a more modern word for "borrowing". When subtracting with decimals, if you are trying to subtract a larger digit from a smaller digit, you "regroup" the next digit to the left by taking one away from it and adding 10 to the number you are subtracting from. Example 84 - 19 _____ You can't subtract 9 from 4, so you take one away from the next digit over (the 8) and add 10 to the 4. 14 - 9 is 5 in the ones digits 7 - 1 is 6 in the tens digits Now if you are subtracting mixed numbers, the regrouping process is essentially the same, except that instead of always regrouping by tens, we regroup by the denominator size. 8 1/5 - 3 3/5 ______ We can't subtract 3/5 from 1/5, so we regroup one unit from the 8 into 5 fifths. 7 6/5 -3 3/5 _______ 4 3/5 It is very easy when you get some practice doing it.


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.


When multiplying decimals count the decimals digits in each?

Yes.


How is adding decimals similar to adding whole numbers?

Adding whole numbers is the addition of decimals where the decimal part is zero; in both cases the digits are place value aligned meaning that the decimal points, which lies between the units (or ones) and tenths columns, are aligned - in the whole number the decimal point is "hiding" at the end.


What determines the number of allowed significant digits when adding or subtracting?

The least number of significant figures in any number of the problem determines the number of significant figures in the answer.


How do you divide single digits with 3 digits?

by using decimals