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 Post subject: Mathematical OperationsPosted: Wed Mar 25, 2009 9:33 pm

Joined: Sat Nov 08, 2008 4:30 pm
Posts: 33
Location: Birmingham
Mathematical Operations

My DS struggles, as much as I do, how to perform different operations in a given sequence. Can someone explain how to solve the followings with some explanations please?

(a) 5.3 + 4.7 x 10 =

(b) 4 â€“ (5+7) -:- 3 =

(c) 14 + (24 â€“ 4 -:- 2) =

(d) (12 + 6 X 2) â€“ 14 -:-5 + 2 =

(e) 30 + 15 -:- 3 X 2 â€“ 14 + (5-8) =

(-:- is the division)

Kevin

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 Post subject: Posted: Wed Mar 25, 2009 9:59 pm
Used BIDMAS: anything in Brackets (within which Bidmas also applies), followed by powers of (Indices), Division, Multiplication, Addition, Subtraction

(a) 5.3 + 4.7 x 10 = 5.3 + 47 = 52.3

(b) 4 â€“ (5+7) -:- 3 = 4 - 12 /3 = 4 - 4 = 0

(c) 14 + (24 â€“ 4 -:- 2) = 14+ (24 -2) = 14 + 22 = 36

(d) (12 + 6 X 2) â€“ 14 -:-5 + 2 = (12 + 12)- 2.8 + 2=24-2.8+2 = 23.2

(e) 30 + 15 -:- 3 X 2 â€“ 14 + (5-8) = 30 + 5 x 2 -14 + (-3)=30+10-14-3=23

I hope these are right.

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 Post subject: Posted: Wed Mar 25, 2009 10:00 pm

Joined: Mon Feb 12, 2007 1:21 pm
Posts: 13993
BIDMAS/BODMAS - brackets first then indices the division/multiplication then addition/subtraction:

(a) 5.3 + 4.7 x 10 = 5.3 + 47 (ie do x first then add)

(b) 4 â€“ (5+7) divide by 3 = 4 - 12 divide by 3 (do bracket first) = 4 - 4 (do division next) = 0

(c) 14 + (24 â€“ 4 divide by 2) = 14+ (24 - 2) = 14 + 22

Does that help a bit?

http://www.cimt.plymouth.ac.uk/projects ... k8_4i3.htm

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 Post subject: Posted: Thu Mar 26, 2009 8:46 pm

Joined: Sat Nov 08, 2008 4:30 pm
Posts: 33
Location: Birmingham
fm and Guest 55, many thanks for you all. Guest55, the web site you mentioned was really helpful and DS enjoyed. He now fully understand how to do that type of questions.

Many Thanks again

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 Post subject: Posted: Thu May 14, 2009 5:26 pm

Joined: Thu Jan 29, 2009 12:40 pm
Posts: 30
Just dipped into this thread - I've never come across bidmas/bodmas before - is this something that is likely to appear on ann 11plus paper?
Thanks!

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 Post subject: Posted: Thu May 14, 2009 8:26 pm
mumbojumbo wrote:
Just dipped into this thread - I've never come across bidmas/bodmas before - is this something that is likely to appear on ann 11plus paper?
Thanks!

It's something they get taught in yr4 so would probably help in the maths paper if they know it.

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 Post subject: Posted: Fri May 15, 2009 8:28 am

Joined: Tue Oct 16, 2007 9:28 am
Posts: 1123
Location: Bexley
[/quote]It's something they get taught in yr4 so would probably help in the maths paper if they know it.[quote]

Not at our school they don't! They haven't even managed it in year 5!!

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 Post subject: Posted: Fri May 15, 2009 8:51 am

Joined: Mon Apr 28, 2008 9:57 am
Posts: 224
Certainly not in DS's school in Yr 4, probably Yr6

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 Post subject: Posted: Fri May 15, 2009 8:54 am

Joined: Wed Nov 21, 2007 4:20 pm
Posts: 4662
My DD's school did it in Y4.

_________________

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 Post subject: Posted: Fri May 15, 2009 9:02 am

Joined: Thu May 01, 2008 5:27 pm
Posts: 3951
Location: london
My DCs school did not do it at all!

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