We received several well reasoned solutions to The Money Maze. Lucy and Hayley from Thomas Reade Primary School and Ben from St Michael's C of E Primary School sent particularly clear solutions where they showed each step in turn. Here is Lucy and Hayley's contribution:

The highest integer:
1. $100 (-10)=$
2. $90 (+150)=$
3. $240 (-50)=$
4. $190 (+120)=$
8. $310 (-20)=$
7. $290 (+145(+50$%$))=$
6. $435 (-50)=$
10. $385 (\times2)=$
11. $770 (-10)=$
15. $760 (+30)=$
16. $790$!!!

Lowest integer:
1. $100 (-50)=$
5. $50 (+10)=$
9. $60 (-50)=$
10. $10 (+5(+50$%$))=$
6. $15 (-20)=$
7. $-5 (\times2)=$
11. $-10 (-10)=$
15. $-20 (+30)=$
16. $10$!!!

I like the way you have presented this, girls, it makes it easy to follow the operations.

A teacher from St Luke's Church of England Primary School Westbeams Road, Sway, Hampshire, sent in the following email.

One of my students, Jasper  has this morning completed this challenge and found a different answer to the second part of the problem to the one published.

Before looking at the solution, he came up with the answer as £40, following this route: