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Can you explain the strategy for winning this game with any target?

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Given the products of diagonally opposite cells - can you complete this Sudoku?

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A game for 2 or more people. Starting with 100, subratct a number from 1 to 9 from the total. You score for making an odd number, a number ending in 0 or a multiple of 6.

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In this activity, the computer chooses a times table and shifts it. Can you work out the table and the shift each time?

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Can you work out the arrangement of the digits in the square so that the given products are correct? The numbers 1 - 9 may be used once and once only.

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In a square in which the houses are evenly spaced, numbers 3 and 10 are opposite each other. What is the smallest and what is the largest possible number of houses in the square?

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Can you complete this jigsaw of the multiplication square?

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Can you fill in this table square? The numbers 2 -12 were used to generate it with just one number used twice.

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Arrange the four number cards on the grid, according to the rules, to make a diagonal, vertical or horizontal line.

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A and B are two interlocking cogwheels having p teeth and q teeth respectively. One tooth on B is painted red. Find the values of p and q for which the red tooth on B contacts every gap on the. . . .

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Can you find a cuboid that has a surface area of exactly 100 square units. Is there more than one? Can you find them all?

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The planet of Vuvv has seven moons. Can you work out how long it is between each super-eclipse?

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The puzzle can be solved by finding the values of the unknown digits (all indicated by asterisks) in the squares of the $9\times9$ grid.

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A student in a maths class was trying to get some information from her teacher. She was given some clues and then the teacher ended by saying, "Well, how old are they?"

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Find the words hidden inside each of the circles by counting around a certain number of spaces to find each letter in turn.

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Which is quicker, counting up to 30 in ones or counting up to 300 in tens? Why?

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Investigate the smallest number of moves it takes to turn these mats upside-down if you can only turn exactly three at a time.

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Got It game for an adult and child. How can you play so that you know you will always win?

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Factors and Multiples game for an adult and child. How can you make sure you win this game?

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A game in which players take it in turns to choose a number. Can you block your opponent?

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Gabriel multiplied together some numbers and then erased them. Can you figure out where each number was?

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Can you work out what step size to take to ensure you visit all the dots on the circle?

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A game for two people, or play online. Given a target number, say 23, and a range of numbers to choose from, say 1-4, players take it in turns to add to the running total to hit their target.

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How many different rectangles can you make using this set of rods?

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Katie and Will have some balloons. Will's balloon burst at exactly the same size as Katie's at the beginning of a puff. How many puffs had Will done before his balloon burst?

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What happens if you join every second point on this circle? How about every third point? Try with different steps and see if you can predict what will happen.

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Work out Tom's number from the answers he gives his friend. He will only answer 'yes' or 'no'.

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How many different shaped boxes can you design for 36 sweets in one layer? Can you arrange the sweets so that no sweets of the same colour are next to each other in any direction?

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Here is a machine with four coloured lights. Can you develop a strategy to work out the rules controlling each light?

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Four of these clues are needed to find the chosen number on this grid and four are true but do nothing to help in finding the number. Can you sort out the clues and find the number?

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Given the products of adjacent cells, can you complete this Sudoku?

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

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What do the numbers shaded in blue on this hundred square have in common? What do you notice about the pink numbers? How about the shaded numbers in the other squares?

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Play this game and see if you can figure out the computer's chosen number.

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The items in the shopping basket add and multiply to give the same amount. What could their prices be?

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Nine squares with side lengths 1, 4, 7, 8, 9, 10, 14, 15, and 18 cm can be fitted together to form a rectangle. What are the dimensions of the rectangle?

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Suppose we allow ourselves to use three numbers less than 10 and multiply them together. How many different products can you find? How do you know you've got them all?

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Play the divisibility game to create numbers in which the first two digits make a number divisible by 2, the first three digits make a number divisible by 3...

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An investigation that gives you the opportunity to make and justify predictions.

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Imagine a wheel with different markings painted on it at regular intervals. Can you predict the colour of the 18th mark? The 100th mark?

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The clues for this Sudoku are the product of the numbers in adjacent squares.

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A game for 2 people using a pack of cards Turn over 2 cards and try to make an odd number or a multiple of 3.

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In this problem we are looking at sets of parallel sticks that cross each other. What is the least number of crossings you can make? And the greatest?

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A collection of resources to support work on Factors and Multiples at Secondary level.

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Ben, Jack and Emma passed counters to each other and ended with the same number of counters. How many did they start with?

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Each light in this interactivity turns on according to a rule. What happens when you enter different numbers? Can you find the smallest number that lights up all four lights?

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There are eight clues to help you find the mystery number on the grid. Four of them are helpful but the other four aren't! Can you sort out the clues and find the number?

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You'll need to know your number properties to win a game of Statement Snap...

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Can you complete this calculation by filling in the missing numbers? In how many different ways can you do it?