1. Nine times
Here are 10 sets of 5.
How many cubes is that?

2. Nine times
I know! 10 x 5 = 50.

3. So how would I change this to get 9 x 5?
Nine times
So how would I change this to get 9 x 5?

4. Nine times
Take off one set of 5.
So 9 x 5 = 45.

5. Nine times
Here are 10 sets of 7.
How many cubes is that?

6. Nine times
I know!
10 x 7 = 70.

7. So how would I change this to get 9 x 7 ?
Nine times
So how would I change this to get 9 x 7 ?

8. Nine times
Take off one set of 7.
So 9 x 7 = 63.

9. There is a pattern in the answers we have found. What do you notice?
Nine times
There is a pattern in the answers we have found. What do you notice?
2 x 9 = 18
3 x 9 = 27
6 x 9 = 54
8 x 9 = 72

10. Nine times
2 x 9 = 18
3 x 9 = 27
The ‘how many nines’ number is always one more than the tens digit of the answer.
6 x 9 = 54
8 x 9 = 72

11. Nine times
Give an example.
2 x 9 = 18
3 x 9 = 27
6 x 9 = 54
8 x 9 = 72

12. 6 x 9 has an answer in the fifties.
Nine times
2 x 9 = 18
3 x 9 = 27
6 x 9 has an answer in the fifties.
6 x 9 = 54
8 x 9 = 72

13. Nine times
What else do you notice?
2 x 9 = 18
3 x 9 = 27
6 x 9 = 54
8 x 9 = 72

14. The digits in each answer add to 9.
Nine times
2 x 9 = 18
3 x 9 = 27
The digits in each answer add to 9.
6 x 9 = 54
8 x 9 = 72

15. Nine times
Give an example.
2 x 9 = 18
3 x 9 = 27
6 x 9 = 54
8 x 9 = 72

16. Nine times
2 x 9 = 18
3 x 9 = 27
2 + 7 = 9.
6 x 9 = 54
8 x 9 = 72