Subject area
Maths
This week's challenge is to find as many lines of 4 consecutive numbers in the grid on which you can place four number cards: 1, 2, 3 and 21.
You can place a number cards on a grid number that is either a factor or a multiple of the number card and your lines can go horizontally, vertically or diagonally.
How many different factor lines can you find?
Here is a link to an interactive version of the challenge:
https://nrich.maths.org/1138/index
**There are also some solutions available via the link - click on the Solution tab.
Activity type