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# Maths year 11 Watch

1. (Original post by z_o_e)
Do I not multiply them?

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Yes, you do multiply them, but you had multiplied them incorrectly

2. (Original post by K-Man_PhysCheM)
Yes, you do multiply them, but you had multiplied them incorrectly

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3. (Original post by z_o_e)
What do you mean like terms? Do I add all the surds up from each bracket?

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You multiply the brackets out, as I had done, and then you collect the terms which can be collected.

is what you get from multiplying out the brackets (you had already done this, bar one term which was incorrectly multiplied).

You can collect the single numbers together () and collect the terms with the same surds together 9, and then simplify.
4. (Original post by K-Man_PhysCheM)
Yes, you do multiply them, but you had multiplied them incorrectly

You told me I multiplied them all wrong?

So is above right?
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5. (Original post by z_o_e)
You told me I multiplied them all wrong!

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You had only multiplied that one incorrectly. The rest were correct.

" The is not correct, because , not

Now you need to collect like terms. "
6. (Original post by K-Man_PhysCheM)
You had only multiplied that one incorrectly. The rest were correct.

" The is not correct, because , not

Now you need to collect like terms. "
Ergh

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7. Past papers !
8. (Original post by K-Man_PhysCheM)
You had only multiplied that one incorrectly. The rest were correct.

" The is not correct, because , not

Now you need to collect like terms. "

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9. Correct. Now remember that RDKGames' question was about a triangle, so how do you find the area of a triangle?
Spoiler:
Show
.

You've already calculated base x height, so what must you do to calculate the triangle's area?
Then you need to find 4.1% of that area to answer the question.
10. (Original post by K-Man_PhysCheM)
Correct. Now remember that RDKGames' question was about a triangle, so how do you find the area of a triangle?
Spoiler:
Show
.

You've already calculated base x height, so what must you do to calculate the triangle's area?
Then you need to find 4.1% of that area to answer the question.
Divide it by 2

And then divide it by 4.1 and times it by 100?

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11. (Original post by z_o_e)
Divide it by 2

And then divide it by 4.1 and times it by 100?

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Divide by 2 is correct, but are you sure that you would calculate 4.1% by dividing by 4.1 and multiplying by 100? Wouldn't that give a much larger number?

E.g .

200 couldn't be 4.1% of 8.2... 200 is much larger than 8.2 !!

But if you try the other way:

Hence, to get a percentage of something, first DIVIDE by 100, then multiply by the percentage you need to find.

However, in that question, do NOT use a calculator: you need to leave it in the form:

Note: you already have the bit:
.

Hence all you need to do is to find the bit.
12. (Original post by K-Man_PhysCheM)
Hence, to get a percentage of something, first DIVIDE by 100, then multiply by the percentage you need to find.
Or just turn 4.1% into straight away which makes the working out smoother.
13. (Original post by RDKGames)
Or just turn 4.1% into straight away which makes the working out smoother.
in my head, and I would just immediately convert between the two, but yeah, I agree the latter would be much neater and easier for the answer format.
14. (Original post by K-Man_PhysCheM)
in my head, and I would just immediately convert between the two, but yeah, I agree the latter would be much neater and easier for the answer format.

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16. Don't use a calculator! Remember, you have to leave the answer in the form:

Moreover, that is NOT how you work out percentage. Multiply by 4.1 and divide by 100, or in other words:

17. (Original post by RDKGames)
Nope. Don't tell you forgot how to expand brackets with surds...
How are these?

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18. (Original post by z_o_e)
How are these?

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All correct. On the last one there shouldnt be a 2 next to though
19. (Original post by RDKGames)
All correct. On the last one there shouldnt be a 2 next to though
Oh alright x

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20. (Original post by RDKGames)
All correct. On the last one there shouldnt be a 2 next to though
How would I do this one?

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