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Home > CC2 > Chapter 2 > Lesson 2.2.4 > Problem 2-79

2-79.

Compute without a calculatorFind the value of each of the following expressions. Use a tile diagram or a number line to help you, if you need it.  

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    The parentheses used in this problem mean that you should multiply the numbers. If you are having trouble with multiplication, it may help to review problem 2-73.

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    Remember that adding a negative number is just like taking steps backward, or subtracting.

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    Think of the expression as asking how much groups of is.

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    Again, adding negative numbers is like walking backwards. Does it help to think of the expression as a tightrope? The absolute value then removes the negative sign.

    3, equal arrow sections, pointing left, each labeled negative 2.

    The sum of the expression inside the absolute value symbols is , so the absolute value of the expression is .

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    When you multiply a negative number and a positive number, the result is negative. See part (d) about the absolute value.

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    See the hint in part (e).

    The product of this expression is .