See also: Matching titles (5)

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?

Delight your friends with this cunning trick! Can you explain how it works?

It is possible to identify a particular card out of a pack of 15 with the use of some mathematical reasoning. What is this reasoning and can it be applied to other numbers of cards?

A magician took a suit of thirteen cards and held them in his hand face down. Every card he revealed had the same value as the one he had just finished spelling. How did this work?

Try out this number trick. What happens with different starting numbers? What do you notice?

Does this 'trick' for calculating multiples of 11 always work? Why or why not?

Imagine a stack of numbered cards with one on top. Discard the top, put the next card to the bottom and repeat continuously. Can you predict the last card?

A game for 2 or more people, based on the traditional card game Rummy. Players aim to make two `tricks', where each trick has to consist of a picture of a shape, a name that describes that shape, and. . . .

Move your counters through this snake of cards and see how far you can go. Are you surprised by where you end up?

Think of two whole numbers under 10, and follow the steps. I can work out both your numbers very quickly. How?

This resource explores how card tricks can provide an entertaining and often surprising forum for mathematics.

The net of a cube is to be cut from a sheet of card 100 cm square. What is the maximum volume cube that can be made from a single piece of card?

Surprise your friends with this magic square trick.

A collection of short problems to test your understanding of place value.

The problems in this masterclass package offer students the opportunity to engage in a key mathematical activity: moving from particular instances to general cases.

These spinners will give you the tens and unit digits of a number. Can you choose sets of numbers to collect so that you spin six numbers belonging to your sets in as few spins as possible?

My measurements have got all jumbled up! Swap them around and see if you can find a combination where every measurement is valid.

How would you create the largest possible two-digit even number from the digit I've given you and one of your choice?

This article explains how credit card numbers are defined and the check digit serves to verify their accuracy.

Can you picture how to order the cards to reproduce Charlie's card trick for yourself?

Try this version of Snap with a friend - do you know the order of the days of the week?

It might seem impossible but it is possible. How can you cut a playing card to make a hole big enough to walk through?

These practical challenges are all about making a 'tray' and covering it with paper.

Imagine you were given the chance to win some money... and imagine you had nothing to lose...

Can you arrange the red and blue cards so that the rules are all followed?

Using your knowledge of the properties of numbers, can you fill all the squares on the board?

How can you change the area of a shape but keep its perimeter the same? How can you change the perimeter but keep the area the same?

This task develops spatial reasoning skills. By framing and asking questions a member of the team has to find out what mathematical object they have chosen.

Given any 3 digit number you can use the given digits and name another number which is divisible by 37 (e.g. given 628 you say 628371 is divisible by 37 because you know that 6+3 = 2+7 = 8+1 = 9). . . .

This activity is best done with a whole class or in a large group. Can you match the cards? What happens when you add pairs of the numbers together?

My recipe is for 12 cakes - how do I change it if I want to make a different number of cakes?

Can you design a bingo board that gives you the best chance of winning?

Creating mental images is a powerful way to solve maths problems.

The tasks in this feature all contain tricks that use maths, not magic, to make them work!

The tricks in this feature will capture children's curiosity, motivating them to explore and explain.

Weekly Problem 37 - 2015

A piece of card is folded to make an open box. Given its surface area, can you work out its volume?

A personal investigation of Conway's Rational Tangles. What were the interesting questions that needed to be asked, and where did they lead?

This problem is designed to help children to learn, and to use, the two and three times tables.

Try this matching game which will help you recognise different ways of saying the same time interval.

A task which depends on members of the group working collaboratively to reach a single goal.

How can you quickly sort a suit of cards in order from Ace to King?

A task which depends on members of the group working collaboratively to reach a single goal.