Learn a Fact: 2 x 9

1
0
x  9
2
0
x  8
3
7
x  0
4
3
x  1
5
1
x  1
6
1
x  7
7
6
x  2
8
1
x  9
9
4
x  1
10
1
x  8
11
6
x  1
12
3
x  2
13
2
x  9
14
2
x  7
15
4
x  2
16
2
x  1
17
1
x  5
18
2
x  2
19
8
x  2
20
5
x  2

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2

x9


18

9

x2


18

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2
X 8
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