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PostPosted: Sat Apr 14, 2012 9:18 am 
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I'm trying to get ready for a day out and DS2 is booing his eyes out because he can't work out one of his homework sums ....I don't want to give him the answer , but can't help as I don't know how to do it either !

Apologies if it's a really easy one...I am dim , you know :D

1/2 - 9/11 .

He's changed the denominator into 22 for both , but then how do you take 18 from 11 ????

Thanks.


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PostPosted: Sat Apr 14, 2012 9:37 am 
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....end up with a negative answer


1/2 - 9/11 = 11/22-18/22

answer = -7/22


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PostPosted: Sat Apr 14, 2012 9:41 am 
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Poor Scarlett, not a morning person? :lol:

Herm's answer, unless he wrote the sums round the wrong way!


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PostPosted: Sat Apr 14, 2012 10:07 am 
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DS1 did say it would be Herman's answer....but DS2 said he hadn't covered anything like that in class and I did think it seemed a bit tricky for year 5 :? Thanks anyway . :D

P.S I shall be taking special note as to your weak spots over the coming months, WFG... :P


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PostPosted: Sat Apr 14, 2012 10:34 am 
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Yes - they don't normally look at fractions with different denominators and a negative answer is a bit weird!


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PostPosted: Sat Apr 14, 2012 10:41 am 
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Yes, my DS1 has just looked at the replies and said ," But that's secondary school work ! "

Wondering now if I should tell DS2 to leave it or tell him it's a negative answer ( and leave him to work it out ) :?


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PostPosted: Sat Apr 14, 2012 10:44 am 
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is it on a printed sheet or did he write it down?


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PostPosted: Sat Apr 14, 2012 4:26 pm 
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It's on a printed sheet...some of his previous homework questions I often thought weren't quite right such as the one which states...

In a box there are 12 pieces of paper , each with a number. The first numbered 2, the second 4, the third 6 and so on until 12 ???? Surely that should read 24 ? :? It then goes on to say that if the box is shaken and the numbers are drawn out in pairs and the sum of each pair are.... 8, 12 , 24 , 28 , 40 and 44 what are the numbers that make up the pairs. However , we were told the numbers only went up to 12 so DS couldn't really do it ( but could with the numbers up to 24...but kept telling me it was just up to 12 as that's what the teacher had written.)


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PostPosted: Sat Apr 14, 2012 8:35 pm 
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Just to be pedantic if it is a take away it is not a sum but a calculation


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