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 $1+\sqrt 2+\sqrt 3$.

Is it true that $99^n$ has 2n digits and $999^n$ has 3n digits? Investigate!

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

True or false?