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 Post subject: homework
PostPosted: Tue Dec 04, 2007 8:37 pm 
Hi,
Hope someone can please help. yr 7 DD missed a math lesson due to sickness last week and now doesn't understand. I've looked thro' the math text book and I've followed some of the explanations but am struggling with this myself and therefore have no chance of explaining.

Multiplication & division of fractions:

okay, glasses on............

2 1/3 + 4/9 + 1 5/6

I've got 7/3 + 4/9 + 11/6 = 22/18

but now i've lost the plot...............

dd tired and pmt, I don't want to answer the question for her, I want to explain how to reach the answer.

She hasn't finished the question yet but has got as far as

2 1/3 + 4/9 + 1 5/6 = 2 6/18 + 8/18 +

gone into strop and the rest is history

any help most gratefullt appreciated

am registered but fear identification.................

see you in REHAB l8r

thanx

Sue


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 Post subject:
PostPosted: Tue Dec 04, 2007 9:00 pm 
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Joined: Mon Feb 12, 2007 1:21 pm
Posts: 11938
2 1/3 + 4/9 + 1 5/6

Add whole numbers 2 + 1 = 3

add fractions 1/3 + 4/9 + 5/6

can only add when the denominator is common to all

18 is the lowest number 3, 9 and 6 divide exactly into so need to change all three into 18ths

6/18 + 8/18 + 15/18 = 29/18 = 1 11/18

answer is 3 + 1 11/18 = 4 11/18


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 Post subject:
PostPosted: Tue Dec 04, 2007 9:08 pm 
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Joined: Tue Dec 13, 2005 12:49 pm
Posts: 1647
Location: berkshire
To add a fraction...

Express all fractions in terms of the lowest common demoninator and add the numerators together

therefore

2 1/3 + 4/9 + 1 5/6

(the lowest number that is divisible by 3, 9 & 6 is 18 )

turn them all into 18ths

2 6/18+ 8/18 + 1 15/18

add them together

2+1 +6/18 + 8/18 + 15/18

3 + 29/18

4 11/18

I think :oops: .... but it is late and I have got a steaming cold...


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 Post subject: Homework
PostPosted: Tue Dec 04, 2007 9:10 pm 
Guest 55.
Thank you so much,
I kind of get it now, dd doesn't but only because she has gone beyond the tired threshold.
Tomorrow brings another day and hopefully understanding will dawn!
Sue


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 Post subject:
PostPosted: Tue Dec 04, 2007 9:12 pm 
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Joined: Mon Feb 12, 2007 1:21 pm
Posts: 11938
She had got nearly all the way there really -


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