1. DDz Quorum Friar Posted February 5, 2008 1. DDz Quorum Report Share Posted February 5, 2008 Last night I was helping my 12 year old daughter revise for a maths test on fractions. We had this question: In a school, Quote Link to comment Share on other sites More sharing options...
Rattler Posted February 5, 2008 Report Share Posted February 5, 2008 1/2 x 1/10 = (1 x 1)/(2 x 10) = 1/20 multiply the top numbers (numerators) together over the bottom numbers (denominators) together. Quote Link to comment Share on other sites More sharing options...
Blairgowrie Posted February 5, 2008 Report Share Posted February 5, 2008 Try using 100 as total in school. That means 50 are girls. One tenth are left handed which is 5. That means 5 out of 100 are left handed girls. 5 over 100 equals 1/20. Think that is right. Quote Link to comment Share on other sites More sharing options...
Rattler Posted February 5, 2008 Report Share Posted February 5, 2008 Blairgowrie also has a good way of solving a situation like this - throw some easy numbers at it. BTW - you multiply them together because in math, "1/10th of 1/2", the "of" means x (multiply.) 2 x 4 = 8 means 2 groups "of" four. Quote Link to comment Share on other sites More sharing options...
1. DDz Quorum Friar Posted February 5, 2008 Author 1. DDz Quorum Report Share Posted February 5, 2008 Thanks Pete, but could you explain why you multiply the 1/2 by the 1/10 for me please? Quote Link to comment Share on other sites More sharing options...
GreyKnight Posted February 5, 2008 Report Share Posted February 5, 2008 Wikipedia helps me... http://en.wikipedia.org/wiki/Fraction_%28mathematics%29 Quote Link to comment Share on other sites More sharing options...
BBloke Posted February 5, 2008 Report Share Posted February 5, 2008 It's all down to the "of" as Pete says. Quote Link to comment Share on other sites More sharing options...
Rattler Posted February 5, 2008 Report Share Posted February 5, 2008 you multiply them because you have 1/2 of a group of 1/10. Quote Link to comment Share on other sites More sharing options...
1. DDz Quorum Friar Posted February 6, 2008 Author 1. DDz Quorum Report Share Posted February 6, 2008 Thanks guys for your replies. They have helped...I think. @Pete you multiply them because you have 1/2 of a group of 1/10 The answer is 1/20. I am confused by what you say in the above quote however. The question states that 1/10 of the 1/2 are left handed not 1/2 of the 1/10 Quote Link to comment Share on other sites More sharing options...
Rattler Posted February 6, 2008 Report Share Posted February 6, 2008 That's also correct; multiplication does not worry about order, and without checking, I reversed them. 1. Quote Link to comment Share on other sites More sharing options...
1. DDz Quorum Friar Posted February 6, 2008 Author 1. DDz Quorum Report Share Posted February 6, 2008 Many thanks Pete, or should that be sir? Quote Link to comment Share on other sites More sharing options...
BBloke Posted February 6, 2008 Report Share Posted February 6, 2008 How can I make 10 out of 9 matches without breaking one? Quote Link to comment Share on other sites More sharing options...
1. DDz Quorum Friar Posted February 6, 2008 Author 1. DDz Quorum Report Share Posted February 6, 2008 \ Quote Link to comment Share on other sites More sharing options...
BBloke Posted February 6, 2008 Report Share Posted February 6, 2008 Hehehehe.. I just spell TEN with the nine matches. Quote Link to comment Share on other sites More sharing options...
JensenPark Posted February 6, 2008 Report Share Posted February 6, 2008 Last night I was helping my 12 year old daughter revise for a maths test on fractions. We had this question: In a school, Quote Link to comment Share on other sites More sharing options...
BBloke Posted February 6, 2008 Report Share Posted February 6, 2008 Probably the same amount as boys! Quote Link to comment Share on other sites More sharing options...
Rattler Posted February 6, 2008 Report Share Posted February 6, 2008 Many thanks Pete, or should that be sir? Nae, mate - I work for a living and my parents were married when I was born..... Quote Link to comment Share on other sites More sharing options...
Blairgowrie Posted February 6, 2008 Report Share Posted February 6, 2008 Boy, you guys can really work a thread. Quote Link to comment Share on other sites More sharing options...
BBloke Posted February 6, 2008 Report Share Posted February 6, 2008 Yeah.. Gotta love JP for throwing in the Psycho bash. Quote Link to comment Share on other sites More sharing options...
BadAim Posted February 7, 2008 Report Share Posted February 7, 2008 Boy, you guys can really work a thread. We can work a sheep to, but that's for a different thread......... Quote Link to comment Share on other sites More sharing options...
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