Odd and even numbers

  • Magic Letters
    problem
    Favourite

    Magic Letters

    Age
    11 to 14
    Challenge level

    Charlie has made a Magic V. Can you use his example to make some more? And how about Magic Ls, Ns and Ws?

  • Score
    problem

    Score

    Age
    11 to 14
    Challenge level
    There are exactly 3 ways to add 4 odd numbers to get 10. Find all the ways of adding 8 odd numbers to get 20. To be sure of getting all the solutions you will need to be systematic. What about a total of 15 with 6 odd numbers?
  • Next-door Numbers
    problem

    Next-Door Numbers

    Age
    5 to 7
    Challenge level

    Florence, Ethan and Alma have each added together two 'next-door' numbers. What is the same about their answers?

  • The Set of Numbers
    problem

    The Set of Numbers

    Age
    5 to 7
    Challenge level

    Can you place the numbers from 1 to 10 in the grid?

  • Sorting Numbers
    problem

    Sorting Numbers

    Age
    5 to 7
    Challenge level

    Can you sort numbers into sets? Can you give each set a name?

  • What number?
    problem

    What Number?

    Age
    5 to 7
    Challenge level

    I am less than 25. My ones digit is twice my tens digit. My digits add up to an even number.

  • Numbers as Shapes
    problem

    Numbers as Shapes

    Age
    5 to 7
    Challenge level

    Use cubes to continue making the numbers from 7 to 20. Are they sticks, rectangles or squares?

  • One of Thirty-Six
    problem

    One of Thirty-Six

    Age
    5 to 7
    Challenge level

    Can you find the chosen number from the grid using the clues?

  • 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.

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