Starting with the number 180, take away 9 again and again, joining up the dots as you go. Watch out - don't join all the dots!
If you have only four weights, where could you place them in order
to balance this equaliser?
Can you complete this jigsaw of the multiplication square?
Imagine a wheel with different markings painted on it at regular
intervals. Can you predict the colour of the 18th mark? The 100th
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?
Can you work out how to balance this equaliser? You can put more
than one weight on a hook.
In this activity, the computer chooses a times table and shifts it. Can you work out the table and the shift each time?
Can you predict when you'll be clapping and when you'll be clicking
if you start this rhythm? How about when a friend begins a new
rhythm at the same time?
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?
The planet of Vuvv has seven moons. Can you work out how long it is
between each super-eclipse?
Ben and his mum are planting garlic. Use the interactivity to help
you find out how many cloves of garlic they might have had.
Can you fill in this table square? The numbers 2 -12 were used to generate it with just one number used twice.
Frances and Rishi were given a bag of lollies. They shared them out evenly and had one left over. How many lollies could there have been in the bag?
Can you find the chosen number from the grid using the clues?
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 just the right bubbles to hold your number?
Use the interactivity to sort these numbers into sets. Can you give
each set a name?
Use the interactivities to complete these Venn diagrams.
Can you order the digits from 1-3 to make a number which is divisible by 3 so when the last digit is removed it becomes a 2-figure number divisible by 2, and so on?
Factors and Multiples game for an adult and child. How can you make sure you win this game?
How many trains can you make which are the same length as Matt's, using rods that are identical?
Use the interactivity to create some steady rhythms. How could you
create a rhythm which sounds the same forwards as it does
Arrange any number of counters from these 18 on the grid to make a rectangle. What numbers of counters make rectangles? How many different rectangles can you make with each number of counters?
In this maze of hexagons, you start in the centre at 0. The next
hexagon must be a multiple of 2 and the next a multiple of 5. What
are the possible paths you could take?
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?
This article for teachers describes how number arrays can be a
useful reprentation for many number concepts.
Arrange the four number cards on the grid, according to the rules,
to make a diagonal, vertical or horizontal line.
An environment which simulates working with Cuisenaire rods.
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.
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?
Use this grid to shade the numbers in the way described. Which
numbers do you have left? Do you know what they are called?
An investigation that gives you the opportunity to make and justify
A game that tests your understanding of remainders.
Follow the clues to find the mystery number.
For this challenge, you'll need to play Got It! Can you explain the strategy for winning this game with any target?
Look at the squares in this problem. What does the next square look
like? I draw a square with 81 little squares inside it. How long
and how wide is my square?
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?
48 is called an abundant number because it is less than the sum of
its factors (without itself). Can you find some more abundant
Yasmin and Zach have some bears to share. Which numbers of bears
can they share so that there are none left over?
Pat counts her sweets in different groups and both times she has
some left over. How many sweets could she have had?
Can you place the numbers from 1 to 10 in the grid?
Help share out the biscuits the children have made.
Complete the magic square using the numbers 1 to 25 once each. Each
row, column and diagonal adds up to 65.
Investigate which numbers make these lights come on. What is the smallest number you can find that lights up all the lights?
Can you complete this calculation by filling in the missing numbers? In how many different ways can you do it?
Look at three 'next door neighbours' amongst the counting numbers. Add them together. What do you notice?
Can you work out some different ways to balance this equation?
Have a go at balancing this equation. Can you find different ways of doing it?
Got It game for an adult and child. How can you play so that you know you will always win?
This activity focuses on doubling multiples of five.