What fractions can you find between the square roots of 65 and 67?

Find the polynomial p(x) with integer coefficients such that one solution of the equation p(x)=0 is $1+\sqrt 2+\sqrt 3$.

The squares of any 8 consecutive numbers can be arranged into two sets of four numbers with the same sum. True of false?

Although this problem lends itself to discussion (and use of) binary arithmetic, it is not essential.

Is it possible to create different sets of cards that you can use to identify numbers smaller than or larger than $63$?