Conjecturing and generalising

  • Double or Halve?
    problem

    Double or halve?

    Age
    5 to 7
    Challenge level
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    Throw the dice and decide whether to double or halve the number. Will you be the first to reach the target?

  • Estimating time
    problem

    Estimating time

    Age
    11 to 14
    Challenge level
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    How well can you estimate 10 seconds? Investigate with our timing tool.

  • Doubling Fives
    problem

    Doubling fives

    Age
    5 to 7
    Challenge level
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    This activity focuses on doubling multiples of five.

  • Five Steps to 50
    problem

    Five steps to 50

    Age
    5 to 7
    Challenge level
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    Use five steps to count forwards or backwards in 1s or 10s to get to 50. What strategies did you use?

  • Division Rules
    problem

    Division rules

    Age
    7 to 11
    Challenge level
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    This challenge encourages you to explore dividing a three-digit number by a single-digit number.

  • Sums and Differences 2
    problem

    Sums and differences 2

    Age
    7 to 11
    Challenge level
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    Find the sum and difference between a pair of two-digit numbers. Now find the sum and difference between the sum and difference! What happens?