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Mr Williams’ Year 8107 comments to Mr Williams’ Year 8 |
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hello im stuck on q 7a can u please help??????
doesnt matter any more
Hello
Heeeeeeey.
I’m really stuck on the dividing powers thing for the test tomorrow.
I don’t get it whatsoever.
Please Help >:(
Thankkssssss!
And i don’t understand any of the powers stuff it’s really freaking me out
! HELPPP!
Hey Kioka – I’m just taking some of the stress off Mrs Tibble, so you can ask me your Powers questions – Is that okay?
What exactley is it that you’re stuck on?
Sorry i cant write it out properly but ill try anyway. And btw the bits with stars round are meant to be powers :/
y*6* ÷ y*4* = y x y x y x y x y x y
———————
y x y x y x y
20 2 x 10
—- = ——–
30 3 x 10
= y x y
——-
1
= y*2*
The next one is:
6*-2* = 1 9*1/2* = 9 under the bus shelter thing
—-
6*2* 9*1/2* x 9*1/2* = 9*1* = 9
3 X 3 = 9
= 1
—
36
Sorry i typed it really badly ..
oh no.
its come out wrong.
Kioka,
Is it y to the power 6 divided by y to the power 4?
Write it as y^6 / y^4 (use the hat over the 6 for powers)
As you are dividing, subtract the powers: 6-4=2
so the answer is y^2
okay, so that made minimal sense..
But what I understand is that Q1 (and to use the stars again):
y*6* ÷ y*4*
and you worked it out correctly -
y*6* ÷ y*4* = (yxyxyxyxyxy)÷(yxyxyxy)
so you can cancel the ys below to give (yxy) ÷ 1 = yxy or y*2*, yes?
or you could also say as a general rule that y*a* ÷ y*b* = y*a-b* so for this question: y*6* ÷ y*4* = y*6-4* = y*2*
does that make sense?
for Q2:
Is the question 6*-2* ?
if so: 6*-2* = 1/6*2* = 1/36
Or was the question something different??
oh. thats so simple thanks
ooh, looks like Mrs Tibble got there first!
I need to get my typing skills up to scratch…
heey again Grace
i get the first answer but i dont get the second one..
i dont even know what the question is its just some random notes i made for my test tomorrow. i think ill just ask mr williams tomorrow
thanksss soooooooo soooooo muchh for your help though
hhahaaaa
Sorry I couldn’t help on that one, and since you don’t know what the question is I’m probably no help anyway!
what does it mean when it asks if results in survay are representative?
Hi Amy,
When you do a survey, it is usually impossible to ask every single person the questions so you ask a sample of the population instead. The sample needs to be chosen carefully so that every aspect of your total population is represented in the sample. eg match the proportions of young/old, male/female etc This is done to avoid getting biased answers. Such a sample is then said to be representative of the population.
Hope that I’ve put that in a way that you can understand.
JT
oh, i get it now. thankyou
im stuck on question 5d on pg 65 im really stuck can someone pease help me!!
Monica, the spread means what it says! How spread out are the prices? ie what is the range?
I have not got the revision guide for maths as I was not in the lesson the day my friends say Mr williams gave it out. So could somone please put what we have to revise on the site. That would be a big help for revision.
Thanks you
Hi Anastasia,
Here it is:
Year 8 Revision List for January 2010
Number work:
How to write a number as the product of its prime factors
HCF and LCM
Fractions:
what a fraction represents
writing a fraction in its lowest terms
equivalent fractions
adding, subtracting, multiplying, dividing
mixed numbers and improper fractions
percentages
decimal fractions
fraction, percentage, decimal equivalents
fractions of quantities
percentages of quantities
Algebra: Sequences and nth term rule
Shape and Space:
Names of triangles and polygons
Interior and exterior angles
Angle sums
Tessellations
Constructing triangles with compasses
Angle types
Angles and parallel lines
Area of square, rectangle, triangle
Probability and data handling:
pie charts including angle calculation
bar charts
probability facts
working out probability values
probability of an event not happening
Thanks. Have a lovely christmas.
Hi
does any1 knw what tessellations are cause i dont think we learnt that ?
It’s like arranging tiles to cover the kitchen floor. The tile has to remain the same shape, but you can turn it round and put them together so it covers an area with no gaps. That make sense?
Yes thank you
Hi, do we need to learn standard form. I was just wondering as we did quite a bit of that in class.
Only if it’s on the revision list.
ok. Thank you
Hi, Just wondering what is Sequences and nth term rule? and also were we meant to get practise papers as my mum says we were but I never got one. thanks
Hi Phoebe,
I’m sure you know what a sequence is – a list of numbers that follow a rule
eg if the rule is start with 5 and add 7 each time, then the sequence is
5 12 19 26 33 etc
the term-to-term rule is ‘add 7′
and the position-to-term rule (or nth term rule) is 7n – 2 because to get the term you multiply the position number (n) by 7 and subtract 2.
Hope that helps.
JT
PS The revision papers can be found via the revision tab at the top of the page. There seem to be problems with the link though so use the KS3 link instead if you can’t access them.
Thanks – Just one thing though do you always have to multiply and then subtract 2 on the nth term rule?
Hi Phoebe,
Multiply yes, subtract no – depends on whether or not the numbers in the sequence match the times table or not.
eg 5 10 15 20 25 30 has nth term 5n
but 6 11 16 21 26 31 has nth term 5n+1
5n because it is going up in 5s
+1 to get the sequence from the 5 times table
Does that help?
JT
Hi, I’m having trouble with question 4. I know what a fuction machine is, but I’m not sure how to make one for this question. also, in 4b, what is the heading where you put 100, 200, 250, and 400 pounds?
Hannah – is this the homework that is questions 2 and 6 not 2 to 6?
JT
it’s questions 3, 4, 5, and 6 on page 25
Never mind- I get it now. Thanks anyway!
hi
for the graph on page 30 question 4a do we do it at how many minutes she has at the end of the day on her phone
never mind
Hey Mr Williams i’m not sure how to work this question out.
Bob lays 200 bricks in 1 hour
He always works at the same speed.
work out how long it will take bob to lay 960 bricks ?
give my asnwers in hours and minutes?
i know the answer in hours in 4 but i dont know how to work out the minutes ?
Hi Hiba,
Proportion it down eg 200 bricks in 1 hour = 200 bricks in 60 minutes so 20 bricks every 6 minutes.
Does that help?
JT
Yep thankyou
Hello Mr Williams
I’m going through a test paper that we had and I’m stuck on question 2 d…
x/10 + x/5 = 6
???
help me please! thank you
Hi Tallulah,
There are a few ways of doing this – depends on how confident you are with fractions!
One way would be to get all the terms over a common denominator. 6 can be made to look like a fraction by writing it over 1 (which won’t change its value so that’s OK)
Then change the fractions to equivalent fractions, each one over 10. Once their denominators are the same you can form a new equation using just the tops and then solve it.
Have a go and then come back to check your answer.
JT
Thank you very much
x/10 + x/5 = 6
x/10 + 2x/10 = 6
3x/10 = 6
3x = 6 X 10
3x = 60
x = 60/3
x = 20
Is this correct??
Well done Tallulah – that’s correct.
You can check your answer by putting it back into the equation:
20/10 = 2
20/5 = 4
4 + 2 = 6
so your answer works
cool! Thank you miss!
Yes, I checked the answer and it was right!
Yay!
Can anybody tell me what a travel graph is please?
Hi Anastasia,
It’s a graph that gives you information about a journey – hence the name ‘travel’. Axes can be speed – time or distance – time (usually the 2nd one in maths).
JT
Thanks.