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Posted by **Judy** on Tuesday, November 16, 2010 at 2:03pm.

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 -
**Ms. Sue**, Tuesday, November 16, 2010 at 2:25pmYou'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 -
**Henry**, Friday, November 19, 2010 at 7:05pm1. 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 -
**Henry**, Friday, November 19, 2010 at 7:16pmCORRECTION:

3. 3 - 7 - 4 - 2 =

3 - 13 = 10.

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