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Q: What are the three rules of adding and subtracting decimals for 5 grade?

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David Missoula's

to subtrct integers ,rewrite as adding opposites and use the rules for addtion of integers..

Adding integers, if they have the same sign, add their absolute values and keep the same sign. Subtracting, change the sign of the 2nd number and the add using rules of addition. Multiplying and dividing, Divide the absolute values, if the signs are the same the answer is positive, if the signs are different the answer is negative.

There are several rules for decimals, depending on what you want to do.

When subtracting negative numbers change the subtraction sign to a plus and change the second number (which would appear to be positive) to a negative. ex. -14 - 7=?/-14 + -7= -21 When adding negative numbers just add them as they appear. ex. -2 + -5= -7

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They aren't. The rules are the same as those for adding/subtracting or multiplying integers. Just be careful of the decimal point's location.

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your mom is 2

Subtracting a negative is the same as adding the equivalent positive. For example, subtracting minus 10 is the same as adding 10.

Ensure that the denominators are the same when adding or subtracting fractions.

David Missoula's

- when adding or subtracting in scientific notation, you must express the numbers as the same power of 10. This will often involve changing the decimal place of the coefficient.

If their denominators are different then find their lowest common denominator by means of their lowest common multiple remembering to adjust their numerators accordingly before adding or subtracting.

Same rules as adding whole numbers with different signs.

When multiplying something with exponents, you add it. When dividing something with exponents, you subtract it.

Parentheses, exponents, multiplication and division, addition and subtraction.

Well, technically, addition and subtraction are opposites. if you add two numbers together, then you take one and put the other with it. if you subtract two numbers, you take one away from the other. if you are adding or subtracting decimals, then make sure that the decimals are lined up. Fractions have some different rules.

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