Addition and Subtraction: Age 7-11

This is part of our collection of favourite rich tasks arranged by topic.

If you are a teacher, you can find the whole collection on our Primary Curriculum teacher page.
Alternatively, if you are a student, you'll find the same problems on our Primary Curriculum student page.


  • Cubes within Cubes
    problem
    Favourite

    Cubes Within Cubes

    Age
    7 to 14
    Challenge level

    We start with one yellow cube and build around it to make a 3×3×3 cube with red cubes. Then we build around that red cube with blue cubes and so on. How many cubes of each colour have we used?

  • Two and Two
    problem
    Favourite

    Two and Two

    Age
    7 to 16
    Challenge level

    How many solutions can you find to this sum? Each of the different letters stands for a different number.

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