Working systematically

problem

Crack the Code

Age

7 to 11

Challenge level

1 out of 3

The Zargoes use almost the same alphabet as English. What does this birthday message say?
problem

Two Dots

Age

7 to 11

Challenge level

1 out of 3

Place eight dots on this diagram, so that there are only two dots on each straight line and only two dots on each circle.
problem

Seating Arrangements

Age

7 to 11

Challenge level

1 out of 3

Sitting around a table are three girls and three boys. Use the clues to work out were each person is sitting.
problem

Knight's Swap

Age

7 to 11

Challenge level

1 out of 3

Swap the stars with the moons, using only knights' moves (as on a chess board). What is the smallest number of moves possible?
problem

Pasta Timing

Age

7 to 11

Challenge level

1 out of 3

Nina must cook some pasta for 15 minutes but she only has a 7-minute sand-timer and an 11-minute sand-timer. How can she use these timers to measure exactly 15 minutes?
problem

Fake Gold

Age

7 to 11

Challenge level

1 out of 3

A merchant brings four bars of gold to a jeweller. How can the jeweller use the scales just twice to identify the lighter, fake bar?
problem

Tri-Five

Age

7 to 11

Challenge level

1 out of 3

Find all the different shapes that can be made by joining five equilateral triangles edge to edge.
problem

A Shapely Network

Age

7 to 11

Challenge level

1 out of 3

Your challenge is to find the longest way through the network following this rule. You can start and finish anywhere, and with any shape, as long as you follow the correct order.
problem

1 to 8

Age

7 to 11

Challenge level

1 out of 3

Place the numbers 1 to 8 in the circles so that no consecutive numbers are joined by a line.
problem

Chocs, Mints, Jellies

Age

7 to 11

Challenge level

1 out of 3

In a bowl there are 4 Chocolates, 3 Jellies and 5 Mints. Find a way to share the sweets between the three children so they each get the kind they like. Is there more than one way to do it?