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https://math.answers.com/math-and-arithmetic/How_do_you_calculate_1-2_plus_3-4_plus_5-6----------_plus_19-20

How do you calculate 1-2 plus 3-4 plus 5-6---------- plus 19-20? - Answers

You have 10 "pairs" of numbers which all give the answer, -1 (negative one or minus one). So your sum is -1 + (-1) + (-1) +... Ten times. i.e (-1) multiplied by 10. So the answer is -10 (negative 10).



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How do you calculate 1-2 plus 3-4 plus 5-6---------- plus 19-20? - Answers

https://math.answers.com/math-and-arithmetic/How_do_you_calculate_1-2_plus_3-4_plus_5-6----------_plus_19-20

You have 10 "pairs" of numbers which all give the answer, -1 (negative one or minus one). So your sum is -1 + (-1) + (-1) +... Ten times. i.e (-1) multiplied by 10. So the answer is -10 (negative 10).



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https://math.answers.com/math-and-arithmetic/How_do_you_calculate_1-2_plus_3-4_plus_5-6----------_plus_19-20

How do you calculate 1-2 plus 3-4 plus 5-6---------- plus 19-20? - Answers

You have 10 "pairs" of numbers which all give the answer, -1 (negative one or minus one). So your sum is -1 + (-1) + (-1) +... Ten times. i.e (-1) multiplied by 10. So the answer is -10 (negative 10).

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      You have 10 "pairs" of numbers which all give the answer, -1 (negative one or minus one). So your sum is -1 + (-1) + (-1) +... Ten times. i.e (-1) multiplied by 10. So the answer is -10 (negative 10).

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