Where Can We Visit?

Charlie and Abi put a counter on 42. They wondered if they could visit all the other numbers on their 1-100 board, moving the counter using just these two operations: x2 and -5. What do you think?

Gr8 Coach

Can you coach your rowing eight to win?

Babylon Numbers

Can you make a hypothesis to explain these ancient numbers?

Arithmagons

Stage: 3 Challenge Level:

How does the sum of the numbers at the edges relate to the sum of the numbers at the vertices?

It might help to label the numbers at the vertices $A$, $B$ and $C$ and then express the edge numbers in terms of $A$, $B$ and $C$.