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

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

15 = 7 + 8 and 10 = 1 + 2 + 3 + 4. Can you say which numbers can be expressed as the sum of two or more consecutive integers?

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

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

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

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?"

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?

Can you complete this jigsaw of the multiplication square?

"Ip dip sky blue! Who's 'it'? It's you!" Where would you position yourself so that you are 'it' if there are two players? Three players ...?

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

There are ten children in Becky's group. Can you find a set of numbers for each of them? Are there any other sets?

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

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.

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

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?

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.

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

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

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?

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?

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

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

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

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

Can you find different ways of creating paths using these paving slabs?

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

Number problems at primary level that may require resilience.

Can you find a relationship between the number of dots on the circle and the number of steps that will ensure that all points are hit?

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

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

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

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?

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?

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?

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...

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.

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.

48 is called an abundant number because it is less than the sum of its factors (without itself). Can you find some more abundant numbers?

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?

Benâ€™s class were cutting up number tracks. First they cut them into twos and added up the numbers on each piece. What patterns could they see?

Place four pebbles on the sand in the form of a square. Keep adding as few pebbles as necessary to double the area. How many extra pebbles are added each time?

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

Are these statements always true, sometimes true or never true?

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

Complete the magic square using the numbers 1 to 25 once each. Each row, column and diagonal adds up to 65.

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

Choose any 3 digits and make a 6 digit number by repeating the 3 digits in the same order (e.g. 594594). Explain why whatever digits you choose the number will always be divisible by 7, 11 and 13.

Each clue in this Sudoku is the product of the two numbers in adjacent cells.