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 Post subject: mathsPosted: Sat Apr 12, 2008 6:54 pm

Joined: Sat Apr 12, 2008 6:46 pm
Posts: 5
-7+(-3) - (-5) =

-(-7) + (-10) + (-2) =

(-6) - (-8) + (-11) =

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 Post subject: Posted: Sat Apr 12, 2008 8:18 pm

Joined: Tue Jan 01, 2008 1:05 pm
Posts: 515
-7+(-3) - (-5) = -5

-(-7) + (-10) + (-2) = -5

(-6) - (- + (-11) =?

-&+=-
+&-=-
-&-=+

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 Post subject: Posted: Sun Apr 13, 2008 7:38 am

Joined: Sat Apr 12, 2008 6:46 pm
Posts: 5
Thanks alot. But my problem is howto work the answers eg (-7+(-3) - (-5) =-5. How is it worked out.

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 Post subject: Posted: Sun Apr 13, 2008 8:18 am

Joined: Mon Feb 12, 2007 1:21 pm
Posts: 11703
Does this help?

http://www.cimt.plymouth.ac.uk/projects ... 7_15i1.htm

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 Post subject: Posted: Sun Apr 13, 2008 5:16 pm

Joined: Sat Nov 24, 2007 11:09 pm
Posts: 218
uwacla wrote:
Thanks alot. But my problem is howto work the answers eg (-7+(-3) - (-5) =-5. How is it worked out.

-7+(-3)-(-5)
= -7-3+5 because +(-3)=-3 And -(-5)=+5
= -10+5
= -5

Hope it helps

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 Post subject: Posted: Mon Apr 14, 2008 8:11 am

Joined: Mon Jun 18, 2007 2:32 pm
Posts: 6940
Location: East Kent
try using a number line (a ruler is useful) to help you visualise the problem..

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 Post subject: Posted: Mon Apr 14, 2008 10:03 am

Joined: Thu Jan 12, 2006 3:29 pm
Posts: 625
Hi

-12 -11 -10 -9 -8 -7 -6 -5 -4

-7 is the starting value

+ (- 3) ultimately a student should know that a + - = -

-3 takes you to -10

- (-5) ultimately a student should know that - - = +

+ 5 takes you to -5

-12 -11 -10 -9 -8 -7 -6 -5 -4

The + and - sign indicate the direction in which you travel along the number line.

+ goes right and - goes left.

When two signs are together the following applies;

-7 is the starting point

+ (-3)

indicates that you are going to move right (+) but followed by (-) means you have to change direction, go left 3 places to -10.

- (-5)

indicates that you are going to move left (-) but followed by (-) means you have to change direction, go right five places to -5

With the + + combination

indicates you are going to move right (+) followed by (+) means you will continue moving right.

With the - + combination

indicates you are going to move left (-) followed by (+) means you will continue moving left.

With triple combinations e.g - - -
Indicates you are going to move left (-) followed by (-) means you will have to change direction to the right, followed by (-) means you have to change direction to move left.

Regards

Mike

_________________
Mike Edwards is a co-author of The Tutors product range.

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