### Happy Multiplication Day!

For help learning the Times Table facts, check out my multiplication blog post series:

Encourage your family to play with math every day:

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# Most Difficult Math Fact in the Whole Times Table

### Happy Multiplication Day!

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2 thoughts on “Most Difficult Math Fact in the Whole Times Table”

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For help learning the Times Table facts, check out my multiplication blog post series:

Encourage your family to play with math every day:

I think the multiplication table can be a good tool for professional development; there are a lot of great non-routine questions you can ask about it, and it has a low-entry point [teachers have all seen it some capacity] with problems ranging from challenging (What percentage of the entries in a filled out 10 by 10 table is odd?) to way-too-difficult (Can you find a formula for the number of distinct entries in an nxn table?). &c.

You can weave in a lot of number theory, too: factors, multiplies, squares, almost-squares and the distributive property…