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# Maths help Watch

1. I know how to work this out but is there a quick formula or method to do this rather than writing it out...

The bells in St Gabriel's church ring every 6 minutes. The bells in St. Paul's ring every 9 minutes. Both bells ring at 9:00 am. When is the next time they ring together?

Many thanks

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2. (Original post by Xphoenix)
I know how to work this out but is there a quick formula or method to do this rather than writing it out...

The bells in St Gabriel's church ring every 6 minutes. The bells in St. Paul's ring every 9 minutes. Both bells ring at 9:00 am. When is the next time they ring together?

Many thanks
Most people would solve it by writing down lists.

What is the lowest common multiplier of 6 and 9?
3. so u just work out Lcm of the two numbers?

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4. (Original post by Mr M)
Most people would solve it by writing down lists.

What is the lowest common multiplier of 6 and 9?
So u would just work out the Lcm of the two numbers?

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5. (Original post by Xphoenix)
So u would just work out the Lcm of the two numbers?

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Yes but then you need to add this to the starting time.
6. (Original post by Mr M)
Yes but then you need to add this to the starting time.
Thanks. I listed them but in an exam, I wouldn't have the time to so knowing that this sort of question requires Lcm is good. I'm am grateful.

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7. (Original post by Xphoenix)
Thanks. I listed them but in an exam, I wouldn't have the time to so knowing that this sort of question requires Lcm is good. I'm am grateful.

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That's ok but you would certainly have enough time to list the multiples in the exam. That's what the vast majority of successful candidates do.
8. (Original post by Mr M)
That's ok but you would certainly have enough time to list the multiples in the exam. That's what the vast majority of successful candidates do.
Ok thanks. Can u help me with this one. Algebraically if possible?

I am trying to tile my bathroom floor but need some help. I have some octagonal and some square tiles. Using algebra or a diagram, show that a combination of octogenarian and squares will tessellate.

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9. (Original post by Xphoenix)
Ok thanks. Can u help me with this one. Algebraically if possible?

I am trying to tile my bathroom floor but need some help. I have some octagonal and some square tiles. Using algebra or a diagram, show that a combination of octogenarian and squares will tessellate.

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Octogenarian? Show how the tiles tessellate with a sketch. The angles around a point need to sum to 360 degrees.
10. (Original post by Mr M)
Octogenarian? Show how the tiles tessellate with a sketch. The angles around a point need to sum to 360 degrees.
My main problem here is I don't know what the question Is trying to ask...

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11. (Original post by Xphoenix)
My main problem here is I don't know what the question Is trying to ask...

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Do you know the interior angles of octagons and squares?

Here's a suitable picture.

12. I have a question... How would you write 3rootx as a power of x?
13. (Original post by Mr M)
Do you know the interior angles of octagons and squares?

Here's a suitable picture.

That diagram has made life a lot easier. And I do

Square=360
Octagon= 1080

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14. (Original post by Xphoenix)
That diagram has made life a lot easier. And I do

Square=360
Octagon= 1080

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Yes I meant one single interior angle of each. The angles at a point need to sum to 360 degrees ...
15. (Original post by chromesilver7)
I have a question... How would you write 3rootx as a power of x?
I think it would be 3x to the power of a half.
16. Okay thanks!!
17. (Original post by Mr M)
Yes I meant one single interior angle of each. The angles at a point need to sum to 360 degrees ...
than now I understand the question

So square is 90 and octagon is 135. Which means exterior is 90 for square and 45 for octagon

But I'm still not sure how this helps me other

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18. (Original post by Xphoenix)
than now I understand the question

So square is 90 and octagon is 135. Which means exterior is 90 for square and 45 for octagon

But I'm still not sure how this helps me other

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We don't need exterior.

Look at the picture. Two octagons and a square meet at a point.
19. (Original post by chromesilver7)
Okay thanks!!
20. (Original post by chromesilver7)
I have a question... How would you write 3rootx as a power of x?
Green22 is correct indeed because square root x= power of a half.

You should learn the rules for indices etc.

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