Multiplication and division

  • What's My Weight?
    problem

    What's My Weight?

    Age
    7 to 11
    Challenge level

    There are four equal weights on one side of the scale and an apple on the other side. What can you say that is true about the apple and the weights from the picture?

  • What is Ziffle?
    problem

    What Is Ziffle?

    Age
    7 to 11
    Challenge level

    Can you work out what a ziffle is on the planet Zargon?

  • Clever Keys
    problem

    Clever Keys

    Age
    7 to 11
    Challenge level
    On a calculator, make 15 by using only the 2 key and any of the four operations keys. How many ways can you find to do it?
  • Tom's Number
    problem

    Tom's Number

    Age
    7 to 11
    Challenge level
    Work out Tom's number from the answers he gives his friend. He will only answer 'yes' or 'no'.
  • Oranges and Lemons
    problem

    Oranges and Lemons

    Age
    7 to 11
    Challenge level

    On the table there is a pile of oranges and lemons that weighs exactly one kilogram. Using the information, can you work out how many lemons there are?

  • Back to School
    problem

    Back to School

    Age
    7 to 11
    Challenge level
    Mr. Sunshine tells the children they will have 2 hours of homework. After several calculations, Harry says he hasn't got time to do this homework. Can you see where his reasoning is wrong?
  • Dividing a Cake
    problem

    Dividing a Cake

    Age
    7 to 11
    Challenge level
    Annie cut this numbered cake into 3 pieces with 3 cuts so that the numbers on each piece added to the same total. Where were the cuts and what fraction of the whole cake was each piece?
  • Penta Post
    problem

    Penta Post

    Age
    7 to 11
    Challenge level

    Here are the prices for 1st and 2nd class mail within the UK. You have an unlimited number of each of these stamps. Which stamps would you need to post a parcel weighing 825g?

  • The Clockmaker's Birthday Cake
    problem

    The Clockmaker's Birthday Cake

    Age
    7 to 11
    Challenge level

    The clockmaker's wife cut up his birthday cake to look like a clock face. Can you work out who received each piece?

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