Working systematically

problem

Latin Multiplication

Age

11 to 14

Challenge level

2 out of 3

Can you choose one number from each row and column in this grid to form the largest possibe product?
problem

Football Sum

Age

11 to 14

Challenge level

2 out of 3

Find the values of the nine letters in the sum: FOOT + BALL = GAME
problem

Pair Sums

Age

11 to 14

Challenge level

3 out of 3

Five numbers added together in pairs produce: 0, 2, 4, 4, 6, 8, 9, 11, 13, 15 What are the five numbers?
problem

Coins

Age

11 to 14

Challenge level

3 out of 3

A man has 5 coins in his pocket. Given the clues, can you work out what the coins are?
problem

Distinct in a Line

Age

11 to 14

Challenge level

3 out of 3

This grid can be filled so that each of the numbers 1, 2, 3, 4, 5 appears just once in each row, column and diagonal. Which number goes in the centre square?
problem

Almost Constant Digits

Age

11 to 14

Challenge level

3 out of 3

How many 10-digit numbers containing only 1s, 2s and 3s can you write?
problem

Kangaroo Hops

Age

11 to 14

Challenge level

3 out of 3

Weekly Problem 11 - 2011
Kanga hops ten times in one of four directions. At how many different points can he end up?
problem

The Best Card Trick?

Age

11 to 16

Challenge level

1 out of 3

Time for a little mathemagic! Choose any five cards from a pack and show four of them to your partner. How can they work out the fifth?
problem

Wallpaper Sudoku

Age

11 to 16

Challenge level

1 out of 3

A Sudoku that uses transformations as supporting clues.
problem

Seasonal Twin Sudokus

Age

11 to 16

Challenge level

1 out of 3

This pair of linked Sudokus matches letters with numbers and hides a seasonal greeting. Can you find it?