My Nines Table
I use this to generate the Nines Table for Multiplication.
I write the following on the board:
9 x 1 =
9 x 2 =
9 x 3 =
9 x 4 =
9 x 5 =
9 x 6 =
9 x 7 =
9 x 8 =
9 x 9 =
I tell the students that I have forgotten my nines table for multiplication.
I look at the nine problems on the board and I say, "Well, I know that 9 x 1 = 9,"
since any number times one equals that number.
So, I write 9 beside the first problem.
Now, I say, "Maybe it would help me if I counted the problems.
So, I write a 1 by 9 x 2 =,
Then I say and write a 2 by 9 x 3 = , etc,
so that my chart looks like this:
9 x 1 = 9
9 x 2 = 1
9 x 3 = 2
9 x 4 = 3
9 x 5 = 4
9 x 6 = 5
9 x 7 = 6
9 x 8 = 7
9 x 9 = 8
Now I tell my students, "My math teachers always taught me to check my work."
So I count again, this time starting at the bottom.
My chart now looks like this:
9 x 1 = 9
9 x 2 = 1 8
9 x 3 = 2 7
9 x 4 = 3 6
9 x 5 = 4 5
9 x 6 = 5 4
9 x 7 = 6 3
9 x 8 = 7 2
9 x 9 = 8 1