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Mrs Tibble’s / Mr Atkins’ Year 9801 comments to Mrs Tibble’s / Mr Atkins’ Year 9 |
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What’s P??
???
p is the letter in front of the bracket! Are we in the same book?
I don’t know! Maybe it’s me but now I’m so confused. (Even more than before)
Green book page 7 question 7?
Ameera was asking about something on page 8. What did you write in your planner?
I thought we had to do page 7 question 6.
Sorry, my mistake.
In the box of Yvonne’s homework she has made some mistakes. Your job is to find them.
There are 3 in the 1st line
1 in the 2nd line
2 in the third.
I’m SO CONFUSED! LOL
Wait. OK. I just asked my friend, and she confirmed that we had to do page 7 q6 and page 8 q3,4,5. I’m stuck on q6 of page 7.
Sorry, didn’t mean to send that last one, didnt see you wrote something before. Thanks
I’m stuck on the same as gemma, i don’t get how to figure it out
Hi Imogen,
Yvonne has multiplied out the brackets and/or tidied up incorrectly so you have to try and spot where she made her mistakes.
BIG CLUE check signs as that’s a common error, also that she has multiplied correctly.
okay thank you
Hi, what did we have to make a revision thing on? Powers, Indices and Standard Form right?
Yes that’s right, Gemma. Include rules of indices, power of zero, neg powers, fraction powers, what standard form is, numbers in and out of standard form, and arithmetic in standard form.
Thank you
P.S Do we have to bring it to the lesson tomorrow?
Gemma, this should be written in your planner! I said it was for Monday.
Yes, I know, I did write that, but I’m not sure whether I should bring it in or not….
Wait, hang on. That sounded really dumb. Sorry.
‘If you are in a hole, don’t dig!’
Lol!
Hi Mrs Tibble,
I was wondering if we have to know how to calculate the surface areas of prisms for the exam. In our books it says that it will be on our formula sheet, but it also says to learn it on the revision sheet. So should we?
MERRY CHRISTMAS!!!!
Hi Grace,
Only the complicated ones are on a formula sheet. You are expected to know how to find the area of a square, rectangle, triangle, parallelogram, trapezium and circle. A triangular prism is a collection of triangles and rectangles. A cylinder is circle(s) and a rectangle.
Have fun
Mrs T
Hi Mrs Tibble,
I really don’t get what factorising is. Please can you explain? I’ve looked through my book and I can’t find anything.
Help!
Hey! Why did my picture change??!
Hi Gemma,
No idea why your picture changed – there are some questions even I can’t answer
Factorising is the opposite of multiplying out brackets ie you remove the common factors from each term
eg if you multiply out 2x(x-7)
you get 2x^2 – 14x
Both of these terms are multiples of 2 and multiples of x (because that’s what was outside the bracket.
If you have to factorise 2x^2 – 14x
then you have to decide what the common factors are and divide them back out of the terms.
You can see that the numbers are multiples of 2 so that gives
2(x^2 – 7x)
However inside the bracket the terms still have a common factor of x so that can come out too:
2x(x-7)
If you have found all the common factors, then the terms left inside the bracket will have nothing in common.
Hope that helps.
Mrs T
Thanks, I think I get it…
Thank you for your time!
P.S I liked my other picture…
Hi Mrs Tibble,
In my reportymabob, you told me to research fractals and how they revolutionised animation, but I can’t find anything on them!! D:
I tried the Pixar website like you said, but there was just a load of guff about BlobMan or something. I Googled fractals in animation and all that comes up are loads of weird videos of spinny shapes which, while entertaining and distracting, are relatively useless.
*ahem* To summarise, I would really like some help with it.
Oh, oh also I’ve just started the practice questions and I’m stuck on the first one.
a) Is that bad?
b) Is it a sign of things to come?
c) I’ve forgotten what in terms of x means. What is it?
Thanks
Hi Lily,
Don’t know what the first question is! ‘In terms of x’ just means your equation has x’s in it!
Will get back to you on fractals.
Mrs T
Hi Lily,
Have you tried here
http://en.wikipedia.org/wiki/Computer-generated_imagery
Hi the stuff on wikipedia is all a tad confusing. Do you know any books or anything that could help?
Sorry to be such a fuss, but I’m easily confused D:
Hi Lily,
Save it till after the exams now. Concentrate on those first.
Mrs T
Hi Mrs T,
Sorry to ruin your weekend by asking about maths but, on the booklet you gave us yesterday (the one with multiple choice questions at the beginning), please could you help me with q11. I think I have the answer to part a: 1.240154521… but for part b, what does it mean by ‘Give your answer to part (a) to an appropriate degree of accuracy’? I’m guessing it means make the number shorter, so it would become 1.24… I think.
Thank you in advance.
Hi Emmanuelle,
Answers can’t be more ‘accurate’ than the data you have used to work them out. Look at the numbers in the question and see how many dp or sf have been used. Don’t use more than that in your answer.
Does that help?
Mrs T
Yes that helps a lot! Thank you.
Hi Mrs. T,
Sorry to bother you on a Sunday, but I was doing some revision and I got really confused when you said that when changing fractions to percentages, you need to multiply the fraction by 100%. At first I thought that was straight forward, but now that I think about it, how can you multiply a fraction by 100%???
Oh, and also, what kind of context would questions be in if you had to use the multiplier and unitary methods?
(And compound interest)
Hi Gemma,
Multipliers can be used in all percentage changes questions: sale prices, adding on VAT, compound interest (which is to do with bank accounts most often), depreciation (where something loses value over time).
To do 3/4 as a percentage do 3/4 x 100% = 300%/4 = 75%
Can’t do it here, but when the fractions are written correctly, you can do some cancelling down before you multiply. Mathematically, you are finding an equivalent fraction because 100% is a hundred hundredths so you are multiplying top and bottom by the same thing (or multiplying by 1 if you want to think of it like that).
Have fun
Mrs T
Thanks, also , will there be many questions on Direct Proportion? I understand it, but I just can’t see myself sitting in the exam and remembering what to do! (That is my situation with LOTS of other topics in this subject!)
Is direct proportion on your revision list?
Is that supposed to be a rhetorical question??
Err, I don’t think so, but I assumed that we would be tested on everything that we’ve done so far…
??
You were given a definitive revision list on the green sheet of paper. Remember the exam is for the whole year group and covers only what everyone has done. I did say that numerous times in the lessons!
hi mrs tibble,
having trouble with q3 part d. 5t(3t+6)+2t(t+1). i do not know how to deal with the 6 and 1????
eleanor w
Hi Eleanor,
multiply 5t by 6 to give 30t
and 2t x 1 = 2t
OK now?
Mrs T
Mrs Tibble,
how do you work out brackets with no number outside and only a minus sign?
eg. -(w-4)
I am very confuzzled.
Hi Jadzia,
It means you have to take away everything that’s in the bracket, so
take away w AND take away -4
so -w + 4
If you prefer multiplying by a number, the invisible number is a 1. Pencil it in so that you can see it
Hope you’re defuzzled now!
Mrs. Tibble
I really dont understand the maths question, could you describe what we actually need to find out in more detail or how we can actually figure it out. Im really confused :s :p
Hi Lili,
When is the difference between two square numbers odd?
And when is it even?
The question really explains itself Lili. Look at how you produced the odd answers and how you produced the evens. How does the odd/even nature of the numbers you used affect the result? Can you predict what would always happen?
Mrs T