Skip over navigation
Cambridge University Faculty of Mathematics NRich logo
menu search
  • Teachers expand_more
    • Early years
    • Primary
    • Secondary
    • Post-16
    • Events
    • Professional development
  • Students expand_more
    • Primary
    • Secondary
    • Post-16
  • Parents expand_more
    • Early Years
    • Primary
    • Secondary
    • Post-16
  • Problem-Solving Schools
  • About NRICH expand_more
    • About us
    • Impact stories
    • Support us
    • Our funders
    • Contact us
  • search

Or search by topic

Number and algebra

  • The Number System and Place Value
  • Calculations and Numerical Methods
  • Fractions, Decimals, Percentages, Ratio and Proportion
  • Properties of Numbers
  • Patterns, Sequences and Structure
  • Algebraic expressions, equations and formulae
  • Coordinates, Functions and Graphs

Geometry and measure

  • Angles, Polygons, and Geometrical Proof
  • 3D Geometry, Shape and Space
  • Measuring and calculating with units
  • Transformations and constructions
  • Pythagoras and Trigonometry
  • Vectors and Matrices

Probability and statistics

  • Handling, Processing and Representing Data
  • Probability

Working mathematically

  • Thinking mathematically
  • Developing positive attitudes
  • Cross-curricular contexts

Advanced mathematics

  • Decision Mathematics and Combinatorics
  • Advanced Probability and Statistics
  • Mechanics
  • Calculus

For younger learners

  • Early Years Foundation Stage

Playing with Coins and Mathematical Sudokus

The challenges in this feature give you the chance to think about possible solutions in different ways.

Along with the Five Coins task, we are introducing you to a variation of the well-known Sudoku, by including mathematical clues which challenge you to apply your knowledge of the four operations. For each grid size, there are four different puzzles, at each of three levels of difficulty, so plenty for you to get stuck into!

To introduce the Mathdokus, and to give a flavour of the kind of strategies that you may find useful, you may like to watch this video.

Five Coins

Age 5 to 11
Challenge Level Yellow starYellow star
Ben has five coins in his pocket. How much money might he have?

3 by 3 Mathdokus

Age 7 to 14
Challenge Level Yellow star
Can you use the clues to complete these 3 by 3 Mathematical Sudokus?

4 by 4 Mathdokus

Age 7 to 14
Challenge Level Yellow star
Can you use the clues to complete these 4 by 4 Mathematical Sudokus?

5 by 5 Mathdokus

Age 7 to 16
Challenge Level Yellow star
Can you use the clues to complete these 5 by 5 Mathematical Sudokus?

6 by 6 Mathdokus

Age 7 to 16
Challenge Level Yellow star
Can you use the clues to complete these 6 by 6 Mathematical Sudokus?

Mathdoku Editor

You can use the Mathdoku Editor to create your own Mathdokus.

You may also like

Digging Into Geometry

Dig deeply into geometrical ideas by having a go at the tasks in this Primary student feature.

Playing with Dice

Find a friend and play our dice games.

LP Student Latest

Latest list for the L Primary Students

  • Tech help
  • Accessibility Statement
  • Sign up to our newsletter
  • Twitter X logo

The NRICH Project aims to enrich the mathematical experiences of all learners. To support this aim, members of the NRICH team work in a wide range of capacities, including providing professional development for teachers wishing to embed rich mathematical tasks into everyday classroom practice.

NRICH is part of the family of activities in the Millennium Mathematics Project.

University of Cambridge logo NRICH logo