The Hard Grade 9 Questions Thread 2019

A is 3?

Correct Did you try every digit until it worked or did you use algebra?

A is 3?

How did you get that?

So:
0.4aaaaaaaaaaaaaaa +
0.5a4a4a4a4a4a4a4a
=
0.96767676767


So 0.4a + 0.5a = 0.9(2a) = 0.96
Therefore 2a = 6
So a = 3

Also 4+a =7 so a is definitely 3!

It's actually a very simple question as you've just shown - there's no need for algebra, you just have to look at the digits.

@the bear I disagree. It's too easy

i did it the long algebra way.... but without a calculator

there are plenty of hard A* type questions here:

http://m4ths.com/uploads/3/5/2/1/35219558/new_9_to_1_grade_9_paper_2_calc.pdf

Hey how would I do this

Reasonable questions.
Q8 could do with a bit of tidying up so that AX and AY are obviously in the same direction as AC.

I find Q16 the most interesting.

Q17 looks tough, but is quite straightforward once you've sorted Area = half ab sinC & rearranged ... could be made a little more challenging if it was made to involve cos, rather than sin

there are plenty of hard A* type questions here:

http://m4ths.com/uploads/3/5/2/1/35219558/new_9_to_1_grade_9_paper_2_calc.pdf

for A use pyhagoras
B and C find the scale factor by dividing a by the fraction at the bottom of the second triangle, then multiply 10.5 by the sf (scale factor) to find c and the fractional surd at the left of triangle A by the sf.

Thank you but I don’t get how how I would square the surf to get a could you explain me that part thanks

use a calculator?
Btw u can just multiply 21 by 21= 441 then time it by surd 10 squared which is 10) so 441 x 10=4410

Hi thank you so would I keep the denominator