Maths week

The 20 Dollar Question. 
One of these knots is not a knot.
Which knot is it ?
(a) Red
(b) Blue √
(c) Green
 red blue green

The 20 Dollar Question.
Two of these knots are not knots.
Which two are they?
(a) Red and blue.
(b) Blue and green. √
(c) Red and green.
 red blue green

The 40 Dollar Question. 
This very famous clock is in
the St Pancras Railway
Station in London.
Lots of movies have this
clock in them.
What time is it ?
(a) 11 - 20
(b) 11 - 40√
(c) 7 - 58

 The 60 Dollar Question. 
The start of this century was a day
celebrated through-out the world.
Your parents will remember it !!
What day of the week was
January 1st, 2000 ?
Saturday X

The 80 Dollar Question. 
What is this? It looks quite old
and is in the British Science
Museum.
Is it
(a) A toy.
(b) A money box.
(c) The first calculator.

The 80 Dollar Question. 
At low tide the water comes
up as far as the fourth rung
on the ladder of the ship.
What happens at full tide?
The water
(a) comes up to the top 
of the ladder.
(b) comes up to the
bottom of the ladder.
(c) stays on the fourth
rung of the ladder.