Use cubes to continue making the numbers from 7 to 20. Are they sticks, rectangles or squares?
How many different triangles can you draw on the dotty grid which each have one dot in the middle?
If you split the square into these two pieces, it is possible to fit the pieces together again to make a new shape. How many new shapes can you make?
This challenge is a game for two players. Choose two numbers from the grid and multiply or divide, then mark your answer on the number line. Can you get four in a row before your partner?
Have a go at this well-known challenge. Can you swap the frogs and toads in as few slides and jumps as possible?
You have been given three shapes made out of sponge: a sphere, a cylinder and a cone. Your challenge is to find out how to cut them to make different shapes for printing.
Skippy and Anna are locked in a room in a large castle. The key to that room, and all the other rooms, is a number. The numbers are locked away in a problem. Can you help them to get out?
Many of you approached this problem in a very systematic way.
Go to last month's problems to see more solutions.
Here we look back at the year with NRICH and suggest mathematical summer holiday activities for students, parents and teachers.