### Jordi Muñoz

Éssers vius - La Cèl·lula - La vostra aula

Practice this handy trick for mastering the 9-times table. | 31 Clever And Inexpensive Ideas For Teaching Your Child At Home

How do Japanese Multiply? via Stephen Boak (I wish I could draw this neatly! ;)

Summarize: Commutative: the ORDER in which you add or multiply numbers doesn't matter. Associative: how you GROUP the numbers when you add or multiply doesn't matter. Same kid friendly meanings for identity (how the number still sees itself in the mirror), inverse (opposite and upside down), and distributive (break a number apart).

Interesting. Ramblings of a fifth and sixth grade teacher....

Fractions

This is actually a very smart idea to use in lower elementary to find the greatest common factor as well as the lowest common multiple because when the students get into the higher mathematics when they start learning about the Venn Diagram. However, this could go from being an aid to becoming a crutch for the students.