Factors and multiples

There are 250 NRICH Mathematical resources connected to Factors and multiples
Xavi's T-shirt
problem

Xavi's T-shirt

Age
7 to 16
Challenge level
filled star empty star empty star
How much can you read into a T-shirt?
What numbers can we make now?
problem
Favourite

What numbers can we make now?

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

Imagine we have four bags containing numbers from a sequence. What numbers can we make now?

Mathdoku demonstration
page

Mathdoku demonstration

This video of Charlie and Liz solving a 6 by 6 Mathdoku may give you ideas for strategies to try.
6 by 6 Mathdokus
problem

6 by 6 Mathdokus

Age
7 to 16
Challenge level
filled star empty star empty star
Can you use the clues to complete these 6 by 6 Mathematical Sudokus?
5 by 5 Mathdokus
problem
Favourite

5 by 5 Mathdokus

Age
7 to 16
Challenge level
filled star empty star empty star
Can you use the clues to complete these 5 by 5 Mathematical Sudokus?
4 by 4 Mathdokus
problem
Favourite

4 by 4 Mathdokus

Age
7 to 14
Challenge level
filled star empty star empty star
Can you use the clues to complete these 4 by 4 Mathematical Sudokus?
3 by 3 Mathdokus
problem

3 by 3 Mathdokus

Age
7 to 14
Challenge level
filled star empty star empty star
Can you use the clues to complete these 3 by 3 Mathematical Sudokus?
Celebrate 25 Years of NRICH
game

Celebrate 25 Years of NRICH

To celebrate NRICH's 25th birthday, why not play this special version of our classic game, Got It? Can you devise a strategy so that you will always win?

Mathdoku
problem

Mathdoku

Age
7 to 11
Challenge level
filled star empty star empty star
Complete the Mathdoku grid using the clues. Can you convince us that the number you have chosen for each square has to be correct?
What does it all add up to?
problem

What does it all add up to?

Age
11 to 18
Challenge level
filled star filled star empty star
If you take four consecutive numbers and add them together, the answer will always be even. What else do you notice?