I used this Smart Board presentation when teaching my reception class take-away.
It asks them simple questions such as: The 3 billy goats gruff tried to cross the bridge. But the troll took 1 of them!
How many are left?
The questions only go up to 5, but this is a editable resource. Therefore you could add more sums or make them harder if you wish.
It is easy for the children to come up to your board and drag to move 1 of the goats to under the bridge where the troll is waiting.