Live Problems - Stage 3 & 4

Each time you visit the NRICH site there will be some activities which are 'live'. That means we are inviting you to send us your solutions and we will publish a selection of them, along with your name and school. If you'd like to read more about what we're looking for, read this short article.

Stage 3 and 4 Toughnutslive

Stage: 3 Challenge Level: Challenge Level:1

These Stage 3 and 4 problems have not yet been solved. Can you be the first?

Opening the Doorlive

Stage: 4 and 5 Challenge Level: Challenge Level:1

What happens when we add together two complex numbers?

Strolling Alonglive

Stage: 4 and 5 Challenge Level: Challenge Level:1

What happens when we multiply a complex number by a real or an imaginary number?

Multiples Sudokulive

Stage: 3 Challenge Level: Challenge Level:1

Each clue in this Sudoku is the product of the two numbers in adjacent cells.

Shape Productslive

Stage: 3 Challenge Level: Challenge Level:1

These eleven shapes each stand for a different number. Can you use the multiplication sums to work out what they are?

Number Familieslive

Stage: 3 Challenge Level: Challenge Level:1

How many different number families can you find?

Alison's Quiltlive

Stage: 3 Challenge Level: Challenge Level:2 Challenge Level:2

Nine squares are fitted together to form a rectangle. Can you find its dimensions?

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. More information on many of our other activities can be found here.
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NRICH is part of the family of activities in the Millennium Mathematics Project.