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4th grade algebra

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7 - 7 - 7 - 7 = ?
12 - 15 - 10 - 8 = ?
3 - 7 - 4 - 2 = ?
11 - 9 - 6 - 6 = ?
6 - 5 - 4 - 2 = ?
8 - 5 - 5 - 5 = ?
12 - 7 - 5 - 4 = ?
13 - 3 - 6 - 1 = ?
16 - 10 - 2 - 3 = ?
8 - 2 - 2 - 2 = ?
I am not understanding how to help figure these problems out? I would greatly appreciate the help so I can teach my son how to get these answers.

  • 4th grade algebra -

    You're adding negative numbers. As you've typed the above, all of the first numbers are positive.

    7 - 7 - 7 - 7 = -21

    12 - 15 - 10 - 8 = -21

    Can you do the rest?

    This number line may help you.

    http://www.mathsisfun.com/number-line.html

  • 4th grade algebra -

    1. 7 -7 - 7 -7,

    First, Add all numbers with like signs:
    7 - 21,
    Subtract the smaller number from the
    larger number and use the sign of the
    larger number:

    7 - 21 = -14.


    2. 12 - 15 - 10 - 8,
    12 - 33 = - 21.

    3. 3 - 7 - 4 - 2,
    3 - 14 = - 11.

    All of the remaining problems are similar to the first three. So let's
    try one that's a little different:

    -7 + 7 + 7 + 7 =
    Add all numbers with like signs:
    -7 + 21,
    Subtract the smaller number from the larger number and use the sign of the
    larger number:
    -7 + 21 = 14.

    -6 - 5 + 8 + 10 =
    -11 + 18 = 7.

    I hope this will help.

  • 4th grade algebra -

    CORRECTION:

    3. 3 - 7 - 4 - 2 =
    3 - 13 = 10.

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