The authors of Maths Applets (Alan Graham and Roger Duke) have written an exciting series of short books for the iPad called Mathematics in Pictures.

The electronic books in this 9-book series are aimed particularly at parents, teachers and classroom assistants of children in the under 11 age range.

The electronic books in this 9-book series are aimed particularly at parents, teachers and classroom assistants of children in the under 11 age range.

Book 1: Numbers in Pictures

Book 2: Subtraction and Addition in Pictures

Book 3: Multiplication and Division in Pictures

Book 4: Fractions, %ages and Decimals in Pictures

Book 5: The Calculator in Pictures

Book 6: Algebra in Pictures

Book 7: Statistics in Pictures

Book 8: Geometry in Pictures

Book 9: Solving Problems in Pictures

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From Book 1, Numbers in Pictures

Why 81 is known as a square number.

These 81 discs can be arranged in a square pattern, is why 81 is referred to as a SQUARE number.

This image is based on the 100 square and was created using the following applet, which can be found on this site:

100 square - controlled

This image is based on the 100 square and was created using the following applet, which can be found on this site:

100 square - controlled