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# Maths year 11

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Why bother with a post grad course - waste of time? 17-10-2016
1. (Original post by 34908seikj)
You want to add 10% on the 5000

10% as a decimal is 0.1

and 100% as a decimal is 1

If you were to add 10% of 5000 back onto the 5000, you would have 110% of the original value

Therefore we multiply by 1.1 as 110% = 1.1

When you want to increase by a percentage aways have the value larger than 1, as it accounts for your current value. want to increase by 58% = 1.58, increase by 240% = 2.4 etc. etc.
I got this

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2. (Original post by z_o_e)
I got this

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Correct! You got this.
3. (Original post by 34908seikj)
Correct! You got this.
But the answer page states this :/

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4. (Original post by z_o_e)
But the answer page states this :/

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The book is wrong.

Did it two different ways - either the question is wrong or the answer is.

5. (Original post by 34908seikj)
Correct! You got this.
Yap I agree.
As the other ones I got right

What if I get this on a non calc paper?

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6. (Original post by z_o_e)
Yap I agree.
As the other ones I got right

What if I get this on a non calc paper?

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It won't be. But you can break numbers down. Gimme a sec

Edit:
7. (Original post by 34908seikj)
It won't be. But you can break numbers down. Gimme a sec

Edit:
Don't really understand this.
But it's okay.

I don't know where the 20% comes from :/ is it from the 2 years?

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8. (Original post by z_o_e)
Don't really understand this.
But it's okay.

I don't know where the 20% comes from :/ is it from the 2 years?

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oh no, I was just using that as an example as to how you calculate compound interest without a calculator.

But because I'm ****ing stupid (i've literally just realised) I've forgot the do the second year ;/.

Basically you take the value from the first year then use that as your "starting" value.

So after the first year we have 10800

10800 = 100%

1080 = 10%
2160 = 20%

10800+2160 = 12 960 - amount after 2 years with 20% compound interest (starting with 9000)
9. (Original post by 34908seikj)
oh no, I was just using that as an example as to how you calculate compound interest without a calculator.

But because I'm ****ing stupid (i've literally just realised) I've forgot the do the second year ;/.

Basically you take the value from the first year then use that as your "starting" value.

So after the first year we have 10800

10800 = 100%

1080 = 10%
2160 = 20%

10800+2160 = 12 960 - amount after 2 years with 20% compound interest (starting with 9000)
Awh that's fine
I'm going to revise this now.

And if you can, can you explain depreciation?

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10. (Original post by z_o_e)
Awh that's fine
I'm going to revise this now.

And if you can, can you explain depreciation?

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It's essentially the opposite of compound interest; instead of increasing in value, it decreases.

To calculate compound interest we do, for example 1000*1.1^2 - This will give us the value after 2 years at a rate of 10% compound interest

Now for deprecation we would do 1000*0.9^2 - This will give us the value after 2 years at a rate of deprecation at 10%. (It goes down by 10% of the current value per year)

Just remember with deprecation the decimal must be lower than 1.
11. (Original post by 34908seikj)
It's essentially the opposite of compound interest; instead of increasing in value, it decreases.

To calculate compound interest we do, for example 1000*1.1^2 - This will give us the value after 2 years at a rate of 10% compound interest

Now for deprecation we would do 1000*0.9^2 - This will give us the value after 2 years at a rate of deprecation at 10%. (It goes down by 10% of the current value per year)

Just remember with deprecation the decimal must be lower than 1.
I did this now how is it ?

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12. (Original post by z_o_e)
I did this now how is it ?

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I was unsure what you were doing, considering you were asking about deprecation.
13. (Original post by 34908seikj)
I was unsure what you were doing, considering you were asking about deprecation.
I was increasing not deprecation this

I'm working deprecation after a few questions x

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14. (Original post by z_o_e)
I was increasing not deprecation this

I'm working deprecation after a few questions x

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15. (Original post by 34908seikj)
Yepp I'm making these examples up myself by following yours lol

Here I did this

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16. (Original post by z_o_e)
Yepp I'm making these examples up myself by following yours lol

Here I did this

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Yeah, they're correct. I think you've got the hang of this now
17. (Original post by 34908seikj)
Yeah, they're correct. I think you've got the hang of this now
Thank god!
I hated percentages. I'm actually loving them now.

I hope I get the hang of locai, bearings and sectors now!

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18. (Original post by 34908seikj)
Yeah, they're correct. I think you've got the hang of this now
Can you do a quick example of bearings please.

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19. (Original post by z_o_e)
Can you do a quick example of bearings please.

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http://www.mrbartonmaths.com/resourc...7_bearings.pdf

gimme a min
20. (Original post by z_o_e)
Can you do a quick example of bearings please.

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Here

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