One face of a regular tetrahedron is painted blue and each of the
remaining faces are painted using one of the colours red, green or
yellow. How many different possibilities are there?
What is the smallest number with exactly 14 divisors?
After some matches were played, most of the information in the
table containing the results of the games was accidentally deleted.
What was the score in each match played?
How many right-angled triangles are there with sides that are all
integers less than 100 units?
Five numbers added together in pairs produce: 0, 2, 4, 4, 6, 8, 9, 11, 13, 15 What are the five numbers?
You are only given the three midpoints of the sides of a triangle.
How can you construct the original triangle?
This article takes the reader through divisibility tests and how they work. An article to read with pencil and paper to hand.