The Number Jumbler
The Number Jumbler can always work out your chosen symbol. Can you work out how?
Your number is...
Number lines in disguise
Remainders
I'm thinking of a number. My number is both a multiple of 5 and a multiple of 6. What could my number be?
Odds, evens and more evens
Alison, Bernard and Charlie have been exploring sequences of odd and even numbers, which raise some intriguing questions...
Fractions rectangle
Up, down, flying around
Play this game to learn about adding and subtracting positive and negative numbers
Summing consecutive numbers
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?
Reflecting squarely
In how many ways can you fit all three pieces together to make shapes with line symmetry?
Shady symmetry
Picturing square numbers
Square numbers can be represented as the sum of consecutive odd numbers. What is the sum of 1 + 3 + ..... + 149 + 151 + 153?
Number pyramids
Try entering different sets of numbers in the number pyramids. How does the total at the top change?
Perimeter expressions
Sieve of Eratosthenes
Follow this recipe for sieving numbers and see what interesting patterns emerge.
More number pyramids
When number pyramids have a sequence on the bottom layer, some interesting patterns emerge...