A
green number
at the corners of the card represents a
square number
: the result of a number multiplied by itself (used in game 4).
A
red number
at the corners of the card represents a
prime number
:
a number that has exactly two unique divisors, 1 and itself
(used in game 5).
Appears on cards belonging to the multiplication table
(for sorting out the cards included in game 4).
Symbolizes a “free” card (Joker).
Appears on “Monumerals” (single digit numbers), i.e. numerical cards “1” to “9” (used in games 2 and 3).
Appears on “Twinumerals”, i.e. numerical cards “11”, “22”, etc (used in games 2 and 3).
Appears only on the card “100” – “Trick or Treat?” card
(used in games 2 and 3).
And the
HAT
? It stands for “
H
eads
A
nd
T
ails” of 6’s and 9’s.