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Algebra > Introducing algebra

##### Age 11 to 14 Challenge Level:

Crosses can be drawn on number grids of various sizes. What do you notice when you add opposite ends?

##### Age 11 to 14 Challenge Level:

Think of a number and follow my instructions. Tell me your answer, and I'll tell you what you started with! Can you explain how I know?

##### Age 11 to 14 Challenge Level:

Think of a number... follow the machine's instructions. I know what
your number is! Can you explain how I know?

##### Age 11 to 14 Challenge Level:

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?

##### Age 11 to 14 Challenge Level:

Create some shapes by combining two or more rectangles. What can
you say about the areas and perimeters of the shapes you can make?

##### Age 11 to 14 Challenge Level:

These eleven shapes each stand for a different number. Can you use the multiplication sums to work out what they are?

##### Age 11 to 18 Challenge Level:

Write a Logo program, putting in variables, and see the effect when you change the variables.

##### Age 11 to 18 Challenge Level:

A geometry lab crafted in a functional programming language. Ported
to Flash from the original java at web.comlab.ox.ac.uk/geomlab

##### Age 11 to 18 Challenge Level:

Learn to write procedures and build them into Logo programs. Learn to use variables.