
Mental calculations
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problem
Roll these dice
Roll two red dice and a green dice. Add the two numbers on the red dice and take away the number on the green. What are all the different possible answers?
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page
Integrated sums Sudoku
The puzzle can be solved with the help of small clue-numbers which are either placed on the border lines between selected pairs of neighbouring squares of the grid or placed after slash marks on the intersections between two diagonally adjacent squares.
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article
Clever Carl
What would you do if your teacher asked you add all the numbers from 1 to 100? Find out how Carl Gauss responded when he was asked to do just that.
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gameFavourite
Dicey operations
In these addition and subtraction games, you'll need to think strategically to get closest to the target.
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game
Calculator bingo
This is a game for two players. What must you subtract to remove the rolled digit from your number? The first to zero wins!
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game
Wild Jack
A game for 2 or more players with a pack of cards. Practise your skills of addition, subtraction, multiplication and division to hit the target score.