The Sir Cumference books explain various maths concepts in story form. They are not a maths curriculum.
A great way for children to learn these concepts apart from a traditional maths program. Suits ages 7-14.

Sir Cumference and the First Round Table

Now available from Chariot press.

Covers the concepts of circumference, radius and diameter.

Sir Cumference and the Isle of Immeter

Now available from Chariot Press.

Covers the concept of the area of a circle.

Sir Cumference and Dragon of Pi

Now available from Chariot Press.

Explains the derivation of Pi.

Sir Cumference and the Great Knight of Angleland

Now available from Chariot Press.

Measuring angles.

Sir Cumference and Sword in the Cone

Now available from Chariot Press.

Covers three dimensional measuring.