Friday, October 9, 2009

Multiplication

We made it to Friday!
Today in class we reviewed the idea of related facts. We knew that if 8 x 9=72, then 9 x 8=72, as well. Based on that, we also know that 72 ÷ 9=8, so 72 ÷ 8 must equal 9.
We say the related facts for 72, 9, and 8 are:
9 x 8 = 72

8 x 9 = 72

72 ÷ 9 = 8

72 ÷ 8 = 9

We also discussed that knowing some multiplication facts can help us figure out ones we don't. For example, knowing that 11 x 9 = 99 helps us figure out 12 x 9. We know that if we're multiplying by 12, we can simply add another 9 to the product of 11 x 9 (11 x 9 = 99 + 9 = 108).
So...12 x 9 = 108.
Questions? Post them here.

Remember: Tuesday is Picture Day.  Don't forget to brush your hair!  I hope you have a great Thanksgiving weekend with your families.  These two look like they're off to a great start:



See you Tuesday!
-Ms. Lewis.

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