My two digit number is special because adding the sum of its digits to the product of its digits gives me my original number. What could my number be?
Try entering different sets of numbers in the number pyramids. How does the total at the top change?
When number pyramids have a sequence on the bottom layer, some interesting patterns emerge...
Think of a number... follow the machine's instructions. I know what
your number is! Can you explain how I know?
Crosses can be drawn on number grids of various sizes. What do you notice when you add opposite ends?
Think of a two digit number, reverse the digits, and add the numbers together. Something special happens...
Create some shapes by combining two or more rectangles. What can
you say about the areas and perimeters of the shapes you can make?
Where should you start, if you want to finish back where you started?
Play around with the Fibonacci sequence and discover some surprising results!
Think of two whole numbers under 10, and follow the steps. I can work out both your numbers very quickly. How?
Surprising numerical patterns can be explained using algebra and diagrams...
Can you work out how many brothers and sisters are in the family?
Can you find the volume of a cuboid, given its perimeters?
25 of the storeys of a 50 storey building are painted gold, and the rest are painted black...
Amy misread a question and got an incorrect answer. What should the answer have be?