How can i justify my answer in words in the problem -5 - 3 = -8?

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  1. Subtracting Positive Numbers

    Subtracting positive numbers is just simple subtraction.

    Example: 6 - 3 = 3
    is really saying
    "Positive 6 minus Positive 3 equals Positive 3"
    You could write it as (+6) - (+3) = (+3)

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  2. Subtracting a Negative is the same as Adding

    Ally can be naughty or nice. So Ally's parents have said

    "If you are nice we will add 3 points (+3). If you are naughty, we take away 3 points (-3). When you reach 30 Points you get a toy."

    Ally starts the day with 9 Points:

    Ally's Mum discovers spilt milk: 9-3 = 6

    Then Dad confesses he spilt the milk and writes "undo". Mum calculates: 6-(-3) = 6+3 = 9

    So if you subtract a negative, you gain points
    (ie the same as adding points).

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  3. subtract 3/4 of a cent from $.4900

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