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 Post subject: Is there an easier way?Posted: Fri Jul 08, 2011 10:20 am

Joined: Wed Aug 25, 2010 2:58 pm
Posts: 578
Question:

Put >, < or =

10/26 + 5/8 + 1/4 ___ 0.75 + 0.8

My DC started multiplying the denominators together to find a common factor. This seemed very long winded. I suggested making the fractions into approx decimals Eg 0.38ish+ 0.6ish +0.25 = 1.23ish which is < 1.55.

Is there an easier way that I am missing?

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 Post subject: Re: Is there an easier way?Posted: Fri Jul 08, 2011 10:36 am

Joined: Fri Sep 15, 2006 8:51 am
Posts: 8598
ugh... reckon "..ish" is the answer - time for a bit of estimating...

rt hand side is as you say 1.55

left hand is approx 10/25 (0.4) + 1/4 (0.25) + 5/8 (about 0.6 as you say). added up they don't get anywhere 1.55 so answer is <.

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 Post subject: Re: Is there an easier way?Posted: Fri Jul 08, 2011 2:01 pm

Joined: Tue Sep 01, 2009 3:38 pm
Posts: 2083
Location: Maidstone
Blitz wrote:

My DC started multiplying the denominators together to find a common factor.

Its probably more long winded but more straightforward. Did he remember to check that they were in the lowest? That will make it slightly easier to work out. In this case 10/26 will be 5/13

_________________
Impossible is Nothing.

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 Post subject: Re: Is there an easier way?Posted: Fri Jul 08, 2011 2:29 pm

Joined: Fri Nov 17, 2006 8:54 pm
Posts: 1776
Location: caversham
Blitz wrote:
Question:

Put >, < or =

10/26 + 5/8 + 1/4 ___ 0.75 + 0.8

Is there an easier way that I am missing?

As an approximation try converting the fractions in near hundredths,

40/104 + 60/96 + 25/100 = approx. 125/100 = 1.25 so it is a lot less than 0.75+0.8=1.55.

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