How old am I?
What's Possible?
What's it worth?
Think of Two Numbers
Pick's Theorem
Special Numbers
Pair Products
Elevenses
Partly Painted Cube
Your number was...
Fruity Totals
Your number is...
The Number Jumbler
A little light thinking
Here is a machine with four coloured lights. Can you make two lights switch on at once? Three lights? All four lights?
Charlie's delightful machine
Here is a machine with four coloured lights. Can you develop a strategy to work out the rules controlling each light?
Shifting Times Tables
Can you find a way to identify times tables after they have been shifted up or down?
What numbers can we make now?
Imagine we have four bags containing numbers from a sequence. What numbers can we make now?
Multiplication arithmagons
Can you find the values at the vertices when you know the values on the edges of these multiplication arithmagons?
Arithmagons
Can you find the values at the vertices when you know the values on the edges?
More Number Pyramids
When number pyramids have a sequence on the bottom layer, some interesting patterns emerge...
Number Pyramids
Try entering different sets of numbers in the number pyramids. How does the total at the top change?
What numbers can we make?
Imagine we have four bags containing a large number of 1s, 4s, 7s and 10s. What numbers can we make?
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?