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14 July, 18:44

10 - 25 - 6 + (-2)

-15 - 6 + (-2) Step 1

-9 + (-2) Step 2

-11 Step 3

Which of the following best describes Marissa's mistake?

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  1. 14 July, 22:36
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    Mistake is found in step 2 where the person did their math wrong. You see - 15-6 is another way of saying - 15 + - 6 because of Keep Change Change (KCC). So, - 15+-6 = - 21 and then add it to - 2, which gives us - 23.
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