gooster Posted October 14, 2010 Report Share Posted October 14, 2010 One of my friends has asked me to help with her 9 year old daughter's maths homework and it's scrambling my brain!! You need to make the number 793 from using the following numbers only once: 8, 8, 4, 75, 50 and 100. Help!!!! Link to comment Share on other sites More sharing options...
Hayley Posted October 14, 2010 Report Share Posted October 14, 2010 One of my friends has asked me to help with her 9 year old daughter's maths homework and it's scrambling my brain!! You need to make the number 793 from using the following numbers only once: 8, 8, 4, 75, 50 and 100. Help!!!! (((100+8)x8)+4)-75=793 or ((100-(8-4))x8 + (75-50)=793 Link to comment Share on other sites More sharing options...
JulesB Posted October 14, 2010 Report Share Posted October 14, 2010 I am dead impressed by that. I completely admit I can't do maths on any level, not even 9-year old maths. So how do you even go about working that out Hayley Link to comment Share on other sites More sharing options...
Mags Posted October 14, 2010 Report Share Posted October 14, 2010 Bleedin' 'ell, I'm 44 and wouldn't have a clue where to start on that. I was already really not looking forward to maths with my nearly 6 year old son, now I'm quaking in my boots At least I know I can come here to get the answers Link to comment Share on other sites More sharing options...
gooster Posted October 15, 2010 Author Report Share Posted October 15, 2010 Thank you!!! I have an a level in maths, but having spent the last 4 years doing nothing but adding optician type numbers together has left me rather rusty with number crunching!!! Link to comment Share on other sites More sharing options...
Hayley Posted October 15, 2010 Report Share Posted October 15, 2010 I am dead impressed by that. I completely admit I can't do maths on any level, not even 9-year old maths. So how do you even go about working that out Hayley I have to admit I had a bit of help!! Link to comment Share on other sites More sharing options...
Ian Posted October 21, 2010 Report Share Posted October 21, 2010 (edited) Wouldn't describe myself as a "maths bod" but I do like the odd puzzle, Countdown etc. All you basically needed was the obvious 800 - 7 Starting with 8*100 and looking to use the other numbers you can see 75-50 = 25 so add that to 800 & you have 825. You can also see that 8*4 is 32 and 32 - 25 gives the seven you needed, so (8*100)+(75-50)-(8*4) = 793 Edited October 21, 2010 by Ian Link to comment Share on other sites More sharing options...
murtle Posted October 21, 2010 Report Share Posted October 21, 2010 Nothing is obvious until you know the answer I love maths but often find these challenges a struggle!! Link to comment Share on other sites More sharing options...
JulesB Posted October 21, 2010 Report Share Posted October 21, 2010 Nope, still have no idea Ian, you lost me when you said 'All you basically needed was the obvious 800 - 7' What's obvious about it, I don't even see the numbers 800 and 7 Link to comment Share on other sites More sharing options...
JulesB Posted October 21, 2010 Report Share Posted October 21, 2010 God, it took me so long to try and modify my post it timed out. What I was going to add was You can see why Miss Ripley used to keep me behind in maths and shout at me all the time For me, it's like being colour blind, I just don't 'see' numbers. It really gets my goat, I feel so stupid. Link to comment Share on other sites More sharing options...
Ian Posted October 22, 2010 Report Share Posted October 22, 2010 No offence intended with the "obvious" - I agree sometimes what is obvious to one is not to another, however intelligent. For me though I just looked at the 8 & the 100 & thought it was the "obvious" place to start (I must have watched too many Countdowns when unable to sleep ) given a target of 793 being so close. The rest just fell into place & confirmed I was on the right track. Link to comment Share on other sites More sharing options...
griff Posted October 23, 2010 Report Share Posted October 23, 2010 Nope, still have no idea Ian, you lost me when you said 'All you basically needed was the obvious 800 - 7' What's obvious about it, I don't even see the numbers 800 and 7 God, it took me so long to try and modify my post it timed out. What I was going to add was You can see why Miss Ripley used to keep me behind in maths and shout at me all the time For me, it's like being colour blind, I just don't 'see' numbers. It really gets my goat, I feel so stupid. like you i am crap at maths...always have been, always will be, no matter how hard i tried i just didn't get it i was constantly compared to my genius maths bod brother by maths teachers at secondary school.... i used to just point out i am not brother...we are all different and have our own talents i don't think either you or i are stupid Link to comment Share on other sites More sharing options...
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