The Hard Grade 9 Questions Thread 2019

Hey is there are hard questions for probability or ratio

You can get the same answer with wrong working - not saying you did though

There’s a part of the question where the majority of students would slip up.

O wow... okay for the sake of it I’ll write it out ( sorry if it’s not visually like amazing aha )


Idk but this app kills quality haha

At first glance I think you've made a few mistakes. When working out the UB of z, why did you choose the UB of x?

I’ve always been taught that in order to work out the upper bound of something , it is the upper bound / lower bound hence y I used the upper bound of x

Here you’re doing 2 minus “something” so to find the UB of z you need that “something” to be as small as possible. So you actually need to find the LB of the fraction.

This is a hard question - probably harder than any bounds question in an exam.

OMG OMG OMG oh yeah oh yeah ...... didn’t think it through:/ Ahhh thank you for pointing this out

Would I have lost marks for that even though the answer is correct ?

If this question was in an exam then it would say “you must show all your working”. You would get no marks in this case if the working was wrong.

Also a real equation would probably make it so that incorrect working produced an incorrect answer. When I made this question I rushed it a bit

Ah no problem please make more of these ones! To be fair I wasn’t really like thinking through logically what I was doing , so this is good practice for me to always do that just because a question looks easy.

Thank you

(Non-calculator)

$0.4\dot{a} + 0.5\dot{a}\dot{4} = 0.96\dot{7}\dot{6}$

Find the value of the digit $a$.

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Where do you get these questions from?

I am very confused plz explain

Do you understand the question?

no

Are you familiar with recurring decimal notation e.g. $0.3\dot{4}$ means 0.344444...?

Yeah