Here's a chance to work with large numbers...
This problem offers you two ways to test reactions - use them to investigate your ideas about speeds of reaction.
Here is a Sudoku with a difference! Use information about lowest common multiples to help you solve it.
My measurements have got all jumbled up! Swap them around and see if you can find a combination where every measurement is valid.
Try to solve this very difficult problem and then study our two suggested solutions. How would you use your knowledge to try to solve variants on the original problem?
Four of these clues are needed to find the chosen number on this grid and four are true but do nothing to help in finding the number. Can you sort out the clues and find the number?
