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?