1What is a square number, and why is it called that?
2Explain how to find the square root of 576 using prime factorisation.
3Why can no square number end in 2, 3, 7 or 8, and what are the limits of that test?
4What is the smallest number by which 720 must be multiplied to make a perfect square? Explain your reasoning.
5Between which two whole numbers does the square root of 90 lie, and how would you decide which it is nearer to?