Addition and subtraction

  • problem

    Oh! Harry!

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

    A group of children are using measuring cylinders but they lose the labels. Can you help relabel them?

  • Weights
    problem

    Weights

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

    Different combinations of the weights available allow you to make different totals. Which totals can you make?

  • Rabbits in the pen
    problem

    Rabbits in the pen

    Age
    7 to 11
    Challenge level
    filled star filled star empty star
    Using the statements, can you work out how many of each type of rabbit there are in these pens?
  • Cows and Sheep
    problem

    Cows and sheep

    Age
    7 to 11
    Challenge level
    filled star empty star empty star
    Use your logical reasoning to work out how many cows and how many sheep there are in each field.
  • Sea Level
    problem

    Sea level

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

    What numbers would you put on this number line as it goes under the sea level?

  • Tug Harder!
    problem

    More Tug of war

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

    In this game, you can add, subtract, multiply or divide the numbers on the dice. Which will you do so that you get to the end of the number line first?

  • Tug of War
    problem

    Tug of war

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

    Can you use the numbers on the dice to reach your end of the number line before your partner beats you?

  • Consecutive negative numbers
    problem

    Consecutive negative numbers

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

    Do you notice anything about the solutions when you add and/or subtract consecutive negative numbers?

  • First Connect Three
    problem

    First connect three

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

    Add or subtract the two numbers on the spinners and try to complete a row of three. Are there some numbers that are good to aim for?

  • Connect Three
    problem

    Connect three

    Age
    11 to 16
    Challenge level
    filled star filled star empty star

    In this game the winner is the first to complete a row of three. Are some squares easier to land on than others?