Mental calculations
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5 by 5 Mathdokus
Age
7 to 16
Challenge level
Can you use the clues to complete these 5 by 5 Mathematical Sudokus?
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4 by 4 Mathdokus
Age
7 to 14
Challenge level
Can you use the clues to complete these 4 by 4 Mathematical Sudokus?
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An easy way to multiply by 10?
Age
7 to 11
Challenge level
Do you agree with Badger's statements? Is Badger's reasoning 'watertight'? Why or why not?
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Equivalent pairs
Age
5 to 7
Challenge level
Can you match pairs of cards which show the same amount?
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Arranging additions and sorting subtractions
Age
5 to 7
Challenge level
Order these four calculations from easiest to hardest. How did you decide?
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Subtraction slip
Age
5 to 7
Challenge level
Can you spot the mistake in this video? How would you work out the answer to this calculation?
problem
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Compare the calculations
Age
7 to 11
Challenge level
Can you put these four calculations into order of difficulty? How did you decide?
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Picture your method
Age
7 to 11
Challenge level
Can you match these calculation methods to their visual representations?
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Fruity pairs
Age
5 to 7
Challenge level
Which two items of fruit could Kate and Sam choose? Can you order the prices from lowest to highest?