Multiplication and Division Facts to 144

Happy Thursday!

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.

-Ms. Lewis.