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problem
Strike it out
Use your addition and subtraction skills, combined with some strategic thinking, to beat your partner at this game.
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problem
Seeing squares
Players take it in turns to choose a dot on the grid. The winner is the first to have four dots that can be joined to form a square.
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problem
Next-door numbers
Florence, Ethan and Alma have each added together two 'next-door' numbers. What is the same about their answers?
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problem
Eightness of eight
What do you see as you watch this video? Can you create a similar video for the number 12?
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problem
Unexpected ordering
Watch the video of Fran re-ordering these number cards. What do you notice? Try it for yourself. What happens?
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problem
Digit addition
Try out this number trick. What happens with different starting numbers? What do you notice?
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problem
Ring a ring of numbers
Choose four of the numbers from 1 to 9 to put in the squares so that the differences between joined squares are odd.
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problem
School fair necklaces
How many possible symmetrical necklaces can you find? How do you know you've found them all?
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problem
Consecutive numbers
An investigation involving adding and subtracting sets of consecutive numbers. Lots to find out, lots to explore.
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problem
Number differences
Place the numbers from 1 to 9 in the squares below so that the difference between joined squares is odd. How many different ways can you do this?
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problem
Magic Vs
Can you put the numbers 1-5 in the V shape so that both 'arms' have the same total?
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problem
Surprising split
Does this 'trick' for calculating multiples of 11 always work? Why or why not?