In a square in which the houses are evenly spaced, numbers 3 and 10
are opposite each other. What is the smallest and what is the
largest possible number of houses in the square?

Exactly 195 digits have been used to number the pages in a book.
How many pages does the book have?

1 to 8

Age 7 to 11 Challenge Level:

Place the numbers 1 to 8 in the circles so that no consecutive
numbers are joined by a line. (Consecutive means numbers next to
each other when counting, like 3 and 4).