garlicbutty and any teaching 9s time tables:
A great trick when teaching this is to remind children that the digits in the answers to the 9s times tables always add up to 9.
1 x 9 = 9
2 x 9 = 18 (1+8 = 9)
3 x 9 = 27 (2 +7 = 9)
4 x 9 = 36 (3 + 6 = 9)
5 x 9 = 45 (4+5 = 9)
6 x 9 = 54 (5+4 = 9)
7 x 9 = 63 (6 +3 = 9)
8 x 9 = 72 (7 + 2 = 9)
9 x 9 = 81 (8 + 1 = 9)
10 x 9 = 90 (9 + 0 = 9)
11 x 9 = 99 (9+9 = 18 (but you need to get to one digit so add 1 + 8 = 9)
12 x 9 = 108 (1+0+8 = 9)
also you can see the pattern in the tables from 2 x 9 up to 10 x9 - the answer is always one digit lower than the multiple.
So if you are multiplying 7 x 9 - the answer will begin with 6 and you know that when you add digits within the answer you will get 9 - so what + 6 = 9 - answer is 3 - so 7 x 9 = 63.
The other trick is to hold out your hands face upwards with both pinkies together. Starting at the left hand thumb number each finger 1, 2, 3, 4, 5 (the left hand pinkie), next hand from pinkie 6, 7, 8, 9, 10 (the right hand thumb).
Now with the nine times tables you can use your digits as a calculator. Fold over the factor you are multiplying 9 by - so say 3 x 9 - fold over finger 3. Count the finger before the folded finger (you get two left of the fold) and count the fingers to the right of the fold (you get seven) - answer is 27. Works for all multiples of 9 up to 10.
The fold trick always works on the principle that the numbers to the left of the folded finger are tens and the number of digits to the right of the folded finger are units. Simple, quick, visual trick.
HTH