Conjecturing and generalising

  • Double or Halve?
    problem

    Double or halve?

    Age
    5 to 7
    Challenge level
    filled star empty star empty star

    Throw the dice and decide whether to double or halve the number. Will you be the first to reach the target?

  • Hourglass with blue sand.
    problem

    Estimating time

    Age
    11 to 14
    Challenge level
    filled star filled star empty star

    How well can you estimate 10 seconds? Investigate with our timing tool.

  • Doubling Fives
    problem

    Doubling fives

    Age
    5 to 7
    Challenge level
    filled star empty star empty star

    This activity focuses on doubling multiples of five.

  • Five Steps to 50
    problem

    Five steps to 50

    Age
    5 to 7
    Challenge level
    filled star empty star empty star

    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
    filled star empty star empty star

    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
    filled star empty star empty star
    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?