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https://docs.google.com/spreadsheets/d/1cuxk1iHHhc4F1XYKZ2pmCuZ3IICDKpRuOHc6QIh0b2M/edit#gid=0

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When all the signs are the same, (i.e., all are positive or  all are negative), add the values and maintain the sign.

-3 + -7 + -10= -20

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When the signs are unlike, (not the same), subtract the values, but maintain the sign of the larger value.

-3 + 7 = +(7-3)= -4

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Multiply the values to calculate the product, (answer).

neg. x neg. = pos.

pos. x neg. = neg.

pos. x pos. = pos

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To multiply or divide signed integers, always multiply or divide the absolute values and use these rules to determine the sign of the answer:

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when adding add values with the same signs.  and keep the signs

if signs are different subtract the values keep the sign of the bigger number.

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An integer is a whole number (not a fractional number) that can be positive negative or zero.

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Whole numbers less than zero are called negative integers. The integer zero is neither positive nor negative, and has no sign