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.
In this activity, the computer chooses a times table and shifts it. Can you work out the table and the shift each time?
Arrange the four number cards on the grid, according to the rules, to make a diagonal, vertical or horizontal line.
Can you complete this jigsaw of the multiplication square?
Given the products of diagonally opposite cells - can you complete this Sudoku?
Can you explain the strategy for winning this game with any target?
Investigate the smallest number of moves it takes to turn these mats upside-down if you can only turn exactly three at a time.
Imagine a wheel with different markings painted on it at regular intervals. Can you predict the colour of the 18th mark? The 100th mark?
Got It game for an adult and child. How can you play so that you know you will always win?
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?
Can you work out what a ziffle is on the planet Zargon?
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 planet of Vuvv has seven moons. Can you work out how long it is between each super-eclipse?
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.
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. . . .
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?
Here is a machine with four coloured lights. Can you develop a strategy to work out the rules controlling each light?
A collection of resources to support work on Factors and Multiples at Secondary level.
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?
Can you fill in this table square? The numbers 2 -12 were used to generate it with just one number used twice.
Find the words hidden inside each of the circles by counting around a certain number of spaces to find each letter in turn.
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.
Factors and Multiples game for an adult and child. How can you make sure you win this game?
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.
You'll need to know your number properties to win a game of Statement Snap...
How many different rectangles can you make using this set of rods?
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?"
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.
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?
A game in which players take it in turns to choose a number. Can you block your opponent?
Which is quicker, counting up to 30 in ones or counting up to 300 in tens? Why?
Ben, Jack and Emma passed counters to each other and ended with the same number of counters. How many did they start with?
How can you use just one weighing to find out which box contains the lighter ten coins out of the ten boxes?
I am thinking of three sets of numbers less than 101. Can you find all the numbers in each set from these clues?
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?
Is there an efficient way to work out how many factors a large number has?
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...
I am thinking of three sets of numbers less than 101. They are the red set, the green set and the blue set. Can you find all the numbers in the sets from these clues?
Does this 'trick' for calculating multiples of 11 always work? Why or why not?
An investigation that gives you the opportunity to make and justify predictions.
The clues for this Sudoku are the product of the numbers in adjacent squares.
Number problems at primary level that may require resilience.
These red, yellow and blue spinners were each spun 45 times in total. Can you work out which numbers are on each spinner?
Play this game and see if you can figure out the computer's chosen number.
The items in the shopping basket add and multiply to give the same amount. What could their prices be?
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?
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?
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?
This article for teachers describes how number arrays can be a useful representation for many number concepts.