Mental Calculation
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problemFavouriteNumber Balance
Can you hang weights in the right place to make the the number balance balanced?
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problemFavouriteSort Them Out (1)
Can you each work out the number on your card? What do you notice? How could you sort the cards?
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problemFavouriteWhat Could It Be?
In this calculation, the box represents a missing digit. What could the digit be? What would the solution be in each case?
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problemFavouriteUnit Differences
This challenge is about finding the difference between numbers which have the same tens digit.
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problemFavouriteSubtraction Slip
Can you spot the mistake in this video? How would you work out the answer to this calculation?
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problemFavouriteArranging Additions and Sorting Subtractions
Order these four calculations from easiest to hardest. How did you decide?
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problemFavouriteFind the Difference
Place the numbers 1 to 6 in the circles so that each number is the difference between the two numbers just below it.