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11 Plus Maths – Preparation and Information

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uwacla
Posts: 5
Joined: Sat Apr 12, 2008 7:46 pm

maths

Post by uwacla »

-7+(-3) - (-5) =

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

(-6) - (-8) + (-11) =
dadofkent
Posts: 515
Joined: Tue Jan 01, 2008 2:05 pm

Post by dadofkent »

-7+(-3) - (-5) = -5

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

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

-&+=-
+&-=-
-&-=+
uwacla
Posts: 5
Joined: Sat Apr 12, 2008 7:46 pm

Post by uwacla »

Thanks alot. But my problem is howto work the answers eg (-7+(-3) - (-5) =-5. How is it worked out.
Guest55
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Joined: Mon Feb 12, 2007 2:21 pm

Post by Guest55 »

essex-mum18
Posts: 218
Joined: Sun Nov 25, 2007 12:09 am

Post by essex-mum18 »

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
yoyo123
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Location: East Kent

Post by yoyo123 »

try using a number line (a ruler is useful) to help you visualise the problem..
Mike
Posts: 625
Joined: Thu Jan 12, 2006 4:29 pm

Post by Mike »

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;

The + sign indicates no change of direction and a - sign indicates a change of direction.

-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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