Odd and even numbers

  • The three of hearts playing card on a green background.
    game

    Odds and Threes

    Age
    7 to 11
    Challenge level

    A game for 2 people using a pack of cards. Turn over 2 cards and try to make an odd number or a multiple of 3.

  • Down to Nothing
    game

    Down to Nothing

    Age
    7 to 11
    Challenge level

    A game for 2 or more people. Starting with 100, subratct a number from 1 to 9 from the total. You score for making an odd number, a number ending in 0 or a multiple of 6.

  • Number Tracks
    problem

    Number Tracks

    Age
    7 to 11
    Challenge level

    Ben's class were cutting up number tracks. First they cut them into twos and added up the numbers on each piece. What patterns could they see?

  • The Thousands Game
    problem

    The Thousands Game

    Age
    7 to 11
    Challenge level

    Each child in Class 3 took four numbers out of the bag. Who had made the highest even number?

  • Arrangements
    problem

    Arrangements

    Age
    7 to 11
    Challenge level

    Is it possible to place 2 counters on the 3 by 3 grid so that there is an even number of counters in every row and every column? How about if you have 3 counters or 4 counters or....?

  • Three Spinners
    problem

    Three Spinners

    Age
    7 to 11
    Challenge level

    These red, yellow and blue spinners were each spun 45 times in total. Can you work out which numbers are on each spinner?

  • Diagonal Trace
    problem

    Diagonal Trace

    Age
    7 to 11
    Challenge level
    You can trace over all of the diagonals of a pentagon without lifting your pencil and without going over any more than once. Can the same thing be done with a hexagon or with a heptagon?
  • Sets of Numbers
    problem

    Sets of Numbers

    Age
    7 to 11
    Challenge level

    How many different sets of numbers with at least four members can you find in the numbers in this box?

  • Sets of Four Numbers
    problem

    Sets of Four Numbers

    Age
    7 to 11
    Challenge level

    There are ten children in Becky's group. Can you find a set of numbers for each of them? Are there any other sets?

  • Crossings
    problem

    Crossings

    Age
    7 to 11
    Challenge level

    In this problem we are looking at sets of parallel sticks that cross each other. What is the least number of crossings you can make? And the greatest?

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