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Maths Practice Help!


whisper2011
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Please could someone help!

This may seem really dumb.....i have these questions in my practice booklet!!

1.

post-23504-0-15559400-1307299216_thumb.jpg

LENGTH X WIDTH X HEIGHT = 3.2 x 2.2 = 6.4 x 2 = 12.08 = Answer is 14.08 on calculator and in answer pages but how???????

2.

post-23504-0-35629800-1307299231_thumb.jpg

Same with this but slightly different 3.2 x 2.2 for the area - working it out myself (IN MY HEAD) ITS 6.4? but on the calculator its 7.08 - PLEASE explain!!

Edited by whisper2011
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Please could someone help!

This may seem really dumb.....i have these questions in my practice booklet!!

1.

post-23504-0-15559400-1307299216_thumb.jpg

LENGTH X WIDTH X HEIGHT = 3.2 x 2.2 = 6.4 x 2 = 12.08 = Answer is 14.08 on calculator and in answer pages but how???????

2.

post-23504-0-35629800-1307299231_thumb.jpg

Same with this but slightly different 3.2 x 2.2 for the area - working it out myself (IN MY HEAD) ITS 6.4? but on the calculator its 7.08 - PLEASE explain!!

1. 3.2 x 2.2 is not 6.4.

3.2 x 2.0 = 6.40

3.2 x 2.2 =7.04

7.04 x 2= 14.08

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Please could someone help!

This may seem really dumb.....i have these questions in my practice booklet!!

1.

post-23504-0-15559400-1307299216_thumb.jpg

LENGTH X WIDTH X HEIGHT = 3.2 x 2.2 = 6.4 x 2 = 12.08 = Answer is 14.08 on calculator and in answer pages but how???????

answer ( 3.2x2.2=7.04x2=14.08)

2.

post-23504-0-35629800-1307299231_thumb.jpg

Same with this but slightly different 3.2 x 2.2 for the area - working it out myself (IN MY HEAD) ITS 6.4? but on the calculator its 7.08 - PLEASE explain!!

answer (3.2x2.2=7.04)

To calculate volume its LxWxD

To calculate area its LxW

the best advice i can give is RTQF (Read The Question fully,

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1. 3.2 x 2.2 is not 6.4.

3.2 x 2.0 = 6.40

3.2 x 2.2 =7.04

7.04 x 2= 14.08

How though! that's what i don't understand..

3x2 = 6 and then .2 x .2 = .4 ?

That is the bit that's throwing me :( i just can't get my head around how you get 7 out of it

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How though! that's what i don't understand..

3x2 = 6 and then .2 x .2 = .4 ?

That is the bit that's throwing me :( i just can't get my head around how you get 7 out of it

Ahh I see. Remember that the .2 needs to be multiplied by more than just .2

3.2 x 2.2

So, you need to do 3 x 2.2 = 6.6

Then 0.2 x 2 + 0.2 x 0.2 = 0.4 + 0.04 = 0.44

6.6 + 0.44 = 7.04

7.04 x 2 = 14.08

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Got it!!!!! woo haha

I wasn't multiplying in the correct principle

If i pretend there is no decimal and

3.2

2.2

___

works out at 7.4 :(

You can dismiss topic now :p

Thanks for your help and looking anyway

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I'm going back 10 years from when i done math so i might be wrong, lol... but because there .2 as in a minus number when you add them together you move the decimal point one to the left.

Edited by Wrighty112
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