a) Twenty-thousand four hundred
b) -21
A + * by a – is always a –
c) 27
BIDMAS. Brackets first
d) 8
y=16/2 = 8
e)i) x = 7
e)ii) x = 5
You firstly have -x = -5 which is the same as x = 5
f) 6
g) 1:3
a) 5412
b) 45,42,41,54,52,51,24,25,21,14,15,12
- Start with each digit at a time
always
never
always
sometimes
The above rules are worth remembering. They help when you are checking answers. For example, if you multiply 2 odd numbers in a calculation and get an odd number as your answer, you know something is wrong. So worth remembering these