A pumpkin weighed 6½ kg before it was carved. It now weighs 1½ kg. What fraction of its weight has been removed?
How many ghosts are in the haunted house?
Here are some clues:
There are more than the number of days in October
There are less than the product of 7 and 5
The answer is an odd number
Seven mummies in a row
Fifteen rows plus another two
I think it's time that you should go
Because all those mummies are after you
How many mummies are chasing you?
How many bats?
Clue: A square number;
More than four squared;
Less than four cubed;
Even.
Count your toes and hands and feet
Multiply those three sums
Add the month when ghosts all meet
Subtract the date halloween comes.
Teacher: Tap on a window for a Halloween Starter.
Topics: Starter  Fractions  Mixed
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Teacher, do your students have
access to computers? 

Here a concise URL for a version of this page without the comments.
Transum.org/go/?Start=October31
Here is the URL which will take them to a related student activity called 'Trick or Treat'.
But if it is something less mathematical with a Halloween theme you want:
Spooky sound effect (Ambient Darkness) is by D J Chronos at Freesound.org